A. Expertise domains and significant results
1. In the general framework of MATERIALS SCIENCE
After 20 years of laboratory works supervising at the discipline of Materials Study , which involved direct working with optical microscope (specimen preparation, micrographs recording and results discussing) as well as after 12 years of teaching the lecture, a rich expertise has been accumulated being materialized by publishing, at regional level, of a laboratory woks guide (as coauthor) and at national level of a number of 5 lectures, monographs and selection of tests and applications. Didactical experience also includes teaching the following lectures: Heat and thermochemical treatments , Amorphous materials and Superalloys . The research activity includes improvement of automatic lathes (patent); analyzing ultrasonics effects on heat treated parts (1 paper published in Iasi Polytechnic Bulletin); plastic deformation process (2 published papers in Romanian journal Metalurgia, 2 papers published in the ISI quoted Spanish journal Revista de Metalugia de Madrid and 1 paper published in the ISI quoted international publication Journal of Optoelectronics and Advanced Materials); analyzing the structure of thermochemically treated steels (1 paper published in Iasi Polytechnic Bulletin) and the study the changes produced in low alloy steel pipes as an effect of long lasting exposures to elevated temperatures and pressures, in power stations, (2 papers published in the Romanian journal Metallurgy and New Materials Research and 1 paper published in the ISI quoted Spanish journal Revista de Metalugia de Madrid). The expertise gained in the field of structural analysis, by means of optical microscopy, has caused the inclusion in the research teams of 11 projects.
2. In the framework of research-development of INTELLIGENT MATERIALS
The contributions to knowledge development/ deepening and to the research of intelligent materials, and mainly shape memory alloys, were concretized by:
a) publishing the first three Romanian papers regarding tensile behavior of a Cu-Al-Ni SMA, Metalurgia 46(9) and (10) 1994:
b) defending the PhD thesis Technology and equipment for obtainment of some shape memory alloys , in 1997;
c) implementing seven experimental devices/ technologies, developed during PhD preparation and during the previous type-A grants financed by CNCSIS, into the research infrastructure of Advanced Materials laboratory;
d) introducing new disciplines in the curricula of some faculties from the Technical University from Iasi: (i) Theoretical, technological and applicative bases of shape memory alloys (at the Technical University College); (ii) Shape memory materials and other special materials (Intelligent materials) (at the Faculty of Mechanical Engineering) (iii) Intelligent materials and (iv) Nonmetallic shape memory materials (at the Faculty of Materials Science and Engineering);
e) publishing the results of some research of international present interest, related to:
• The role of preferred crystallization of alpha phase on the shape memory behavior, in the international ISI quoted journals, Journal of alloys and compounds and Materials science and technology , paper published as first author
• Influence of austenitization on alpha phase morphology, in the international ISI quoted journal Materials science and engineering A , paper published as single author
f) publishing 6 books under national publishing houses (among which 1 as single and 5 as first author) and of a total number of 68 papers (53 as single or first author) and 1 patent, all about shape memory alloys
h) participating, as a director, to 4 research contracts (in last 4 years) and as a member of the research team to 11 contracts (6 in the last 5 years)
i) being invited, as a speaker, to the European Symposium of Martensitic Transformation, ESOMAT 2006 , 10-15th September 2006, Bochum, Germany, for oral presentation On the influence of austenitization on the morphology of a -phase in tempered Cu-Zn-Al shape memory alloys (please see attached copy of the scientific program of the symposium)
j) being included, as a visiting scholar at the Ruhr University Bochum, Germany and as a guest scientist at the National Institute for Materials Science from Tsukuba , Japan
k) CNCSIS expert, evaluator for new projects and CEEX expert, evaluator for projects in Module 1
B. Published papers
In international journals,
Ri1 S. Stanciu, and L. G. Bujoreanu, Formation of beta prime stress-induced martensite in the presence of gamma phase in a Cu-Al-Ni-Mn-Fe shape memory alloy, accepted paper in Materials Science & Engineering A, Structural Materials: Properties, Microstructure and Processing, 2007, identifiable in Digital Object Identifier system as DOI:10.1016/j.msea.2007.01.174, last IMPACT FACTOR: 1.347 , determined al the level of the year 2005
Ri2 L.G.Bujoreanu , On the influence of austenitization on the morphology of alpha-phase in tempered Cu-Zn-Al shape memory alloys, , accepted paper in Materials Science & Engineering A, Structural Materials: Properties, Microstructure and Processing, 2007, DOI:10.1016/j.msea.2006.12.223, last IMPACT FACTOR: 1.347 , determined al the level of the year 2005
Ri3 V. Dia, L.G.Bujoreanu , S. Stanciu, C. Munteanu, Study of shape memory effect in lamellar helical springs made from Cu-Zn-Al SMA, , accepted paper in Materials Science & Engineering A, Structural Materials: Properties, Microstructure and Processing, 2007, DOI:10.1016/j.msea.2006.10.211, last IMPACT FACTOR: 1.347 , determined al the level of the year 2005
Ri4 M.Susan, L.G.Bujoreanu , D.G.Galusca, C.Munteanu and M.Mantu, On the drawing in ultrasonic field of metallic wires with high mechanical resistance, Journal of Optoelectronics and Advanced Materials 7(2) April, pp. 637-646, 2005, IMPACT FACTOR: 1.138
Ri5 M.Susan, L.G.Bujoreanu , D.G.Galusca, C.Munteanu and V.Iliescu , Influence of relative deformation rate on tube processing by ultrasonic vibration drawing , Revista de Metalurgia de Madrid 40(2), pp. 109-117, IMPACT FACTOR: 0,798
Ri6 D.Mihai and L.G.Bujoreanu , Mechanical properties degradation in a Cr-Mo low-alloy steel pipe after prolonged use for gas transport in a power plant station , Revista de Metalurgia de Madrid, 38(6), pp. 464-468, 2002, IMPACT FACTOR: 0,131
Rn7 L. G. Bujoreanu , M.L.Craus, V.Dia and V.Plugaru, Response to applied mechanical load of a multivariant martensitic Cu-Zn-Al-Fe shape memory alloy, University Politehnica of Bucharest, Scientific Bulletin, Series B: Chemistry and Materials Science, Vol. 64, No.3, pp. 59-68, 2002, included in ZENTRALBLATT international database
Ri8 L.G.Bujoreanu , M.L.Craus, S.Stanciu and V.Dia, Thermally and stress induced changes in three phase structure of Cu-Zn-Al-Fe shape memory alloy, Materials Science and Technology 16(June), pp. 612-616, 2000 , IMPACT FACTOR: 0,562
Ri9 M.Susan and L.G.Bujoreanu, The metal-tool contact friction at the ultrasonic vibration drawing of ball-bearing steel wires , Revista de Metalurgia de Madrid 35(6), pp. 379-383, 1999, IMPACT FACTOR: 0,186
Ri10 L.G.Bujoreanu , M.L.Craus, I.Rusu, S.Stanciu and D.Sutiman, On the beta 2 to alpha phase transformation in a Cu-Zn-Al – based shape memory alloy , Journal of Alloys and Compounds 278, pp. 190-193, 1998, IMPACT FACTOR: 0,88
In national journals (as first author, selection)
Rn1 Leandru-Gheorghe Bujoreanu , Viorica David, Vasile Dia, Corneliu Munteanu, Evolution of the hysteretic behavior of SMA wires during mechanical and thermal cycling, Bulletin of the Polytechnic Institute of Iasi, tome LII(LVI), fascicle. 6B, section Machine Building , pp. 207-212, 2006
Rn2 Leandru-Gheorghe Bujoreanu, Corneliu Munteanu, Iulian Ionita, Mitica Temneanu and Viorel Koganiceanu, On the shape memory behavior of Cu-based alloys and polyethylene terephthalate (PET) , Bulletin of the Polytechnic Institute of Iasi, tome. LI( LV ), fasc. 4, section Materials Science and Engineering, pp. 43-50, 2005
Rn3 L.G.Bujoreanu and C.Munteanu, Microstructural changes accompanying thermal memory occurrence and stabilization in a Cu-Zn-Al SMA , Series Advances in Micro- and Nanoengineering¸ (Editors Irina Kleps, Dan Dascalu and Jose Kenny), Editura Academiei Romane, Bucuresti, pp. 110-120, 2004
Rn4 L.G.Bujoreanu , S.Stanciu, C.Roman and J.Schürhoff, Characterization of a Cu-Al-Ni-Mn shape memory alloy. II – Effects of thermomechanical loads , Metallurgy and New Materials Researches XI(3), pp. 20-31, 2003
Rn5 L.G.Bujoreanu , R.Chelariu, I.Carcea and M.L.Craus, Characterization of a Cu-Al-Ni-Mn shape memory alloy. I – Physic structure and morphology , Metallurgy and New Materials Researches XI(2), pp. 30-42, 2003
Run L.G.Bujoreanu, Influence of alpha-brass phase on the structure and properties of an experimental Cu-Zn-Al shape memory alloy, Bulletin of the Polytechnic Institute of Iasi, tome XLVIII(LII), fascicle 3-4, section Materials Science and Engineering, pp. 137-144, 2002
Rn7 L.G.Bujoreanu , V.Plugaru and V.Dia, Use of shape memory effect of copper-based alloys at constrained recovery applications , Bulletin of the Polytechnic Institute of Iasi, tome. XLVII(LI), fascicle 3-4, section Materials Science and Engineering, pp. 155-164, 2001
Run L.G.Bujoreanu , Variation of A s critical point during thermomechanical training and subsequent cycling by two-way shape memory effect of a Cu-Zn-Al based shape memory alloy (in Romanian), Metalurgia, 52(3), pp. 17-25, 2000
Rn9 L.G.Bujoreanu, Transformations of quenching martensite, under the effect of applied stress, in a superelastic Cu-Zn-Al shape memory alloy (in Romanian), Metalurgia, 51(8), pp. 64-69, 1999
Rn10 L.G.Bujoreanu , S.Stanciu and V.Dia, Stabilization and cyclic thermomechanical behavior, at a Cu-Al-Ni type shape memory alloy (in Romanian), Metalurgia, 46(10), pp. 47-50, 1994
Rn11 L.G.Bujoreanu , S.Stanciu and V.Dia, Effect of deformation rate on transformation pseudoelasticity at shape memory alloys (in Romanian), Metalurgia, 46(10), pp. 38-46, 1994
Rn12 L.Bujoreanu , S.Stanciu and V.Dia, Elastic behavior at a Cu-Al-Ni shape memory alloy (in Romanian) , Metalurgia, 46(9), pp. 12-17, 1994
In the proceedings of international scientific conferences, as first author
Vi1 L.G.Bujoreanu , I.Ionita, D.G.Galusca and C.Munteanu, The role of secondary stress induced martensite micro plates upon single and two way shape memory effects in a Cu-Zn-Al alloy , 12th Metallurgy & Materials Congress, September 28 – October 02 2005 Istanbul – Turkey, CD-ROM, pp. 1139-1146, 2005
Vi2 L.G.Bujoreanu, Method to increase energy storage efficiency in a Cu-Zn-Al-Fe SMA , Second International Conference on ADVANCED MATERIALS AND STRUCTURES , 19-21 September 2002, Editura Orizonturi Universitare, Timisoara 2002, pp. 51-56, 2002
Vi3 L.G.Bujoreanu , S.Stanciu, I.Hopulele. and V.Dia, The balance between thermal expansion and shape memory effect in a tensioned Cu-Al-Ni - type alloy, subjected to constrained recovery , Metal 96, The 5th International Metallurgical Symposium , 14-16 May 1996 , Ostrava, Czech Republic, pp. 152-158, 1996
Vi4 L.G.Bujoreanu , Variation of pseudoelasticity parameters during mechanical cycling of a shape memory alloyed experimental brass , International conference of scientific communications Modern Technologies in machine building TMCM 96, Vol. II, Cold working technologies, Iasi, 24-25th May 1996, pp. 161-169, 1996
C. Scientific books published in the field
1. M.Nicu, N.Balba, L.G.Bujoreanu , S.Stanciu and F.Apostu , Materials science and engineering. Vol. III Modern materials (in Romanian), 2nd Edition , Editura ECOZONE, Iasi, 188 pages, 2006, ISBN Vol III: 973-7645-21-9
2. R.Chelariu, L.G.Bujoreanu , and C.Roman, Biocompatible metallic titan based materials (in Romanian), Editura Politehnium, Iasi, 215 pages; 2006, ISBN (10) 973-621-153-3; ISBN (13) 978-973-621-153-9
3. L.G.Bujoreanu , S.Stanciu, C.Munteanu and M.Susan, Mechanical and thermal memory of Cu-Zn-Al based alloys (in Romanian), Editura Politehnium, Iasi, 183 pages; 2005, ISBN 973-621-111-8
4. L.G.Bujoreanu and C.Baciu , Materials study. Tests and applications (in Romanian); Editura tehnica, stiintifica si didactica CERMI, Iasi, 198 pages , 2003, ISBN 973-8188-69-5
5. L.G.Bujoreanu Intelligent materials (in Romanian), Editura Junimea, Iasi, 339 pages, 2002, ISBN 973-37-0735-X
6. L.G.Bujoreanu , V.Dia, E.Dragulanescu and G.Rosescu, Technology and equipment for obtainment of some shape memory alloys (in Romanian), Vol. II , Editura Stiintifica Fundatia Metalurgia Romana, Bucuresti, 166 pages, 1999, ISBN 973-98314-8-6
7. L.G.Bujoreanu , V.Dia and S.Marginean, Technology and equipment for obtainment of some shape memory alloys (in Romanian) Vol.I , Editura Stiintifica Fundatia Metalurgia Romana, Bucuresti, 207 pages, 1998, ISBN 973-98314-2-7
8. L.G.Bujoreanu , G.Rosescu and I.Avram, Materials study in machine building (in Romanian), Editura Stiintifica Fundatia Metalurgia Romana, Bucuresti, 321 pages; 1998, ISBN 973-98314-5-1
9. L.G.Bujoreanu and S.Stanciu, Shape memory materials. Practical methods for analysis (in Romanian) , Editura Cermi, Iasi , 144 pages, 1998 , ISBN 973-9378-28-5
10. G.Calugaru, L.G.Bujoreanu , S.Stanciu, I.Hopulele, R.Caliman, O.L.Turcu and I.Apachitei Shape memory. Phenomena and applications (in Romanian) , Editura Plumb, Bacau , 208 pages, 1995, ISBN 973-9150-50-0
11. G.Calugaru, I.Apachitei, R.Caliman, O.L.Turcu and L.G.Bujoreanu, Advanced materials. Amorphous metallic powders (in Romanian) , Editura Plumb, Bacau , 218 pages, 1995, ISBN 973-9150-49-7
D. Patents
B1 Stanciu Sergiu and Bujoreanu Leandru-Gheorghe, Cu-Al-Ni-Fe-Sn shape memory alloy and obtainment procedure for this alloy , patent nr. 111855/ 1994
B2 Stoica Mihai, Perju Costel and Bujoreanu Leandru, Automatic revolver head, patent nr.106352 B1, 30.04.93 BOPI nr.4/93
E. Achieved/ conceived products/ technologies
1. experimental installation for hot rolling up to 1000 0 C, in alumina tube, with instant quenching, up to 15 mm maximum widths and 0.3 mm minimum thickness (developed within PhD thesis)
2. experimental installation for training-cycling in bending lamellar SMA specimens, deflectometer , (developed within PhD thesis)
3. technology for metallurgical processing of active elements from shape memory alloys belonging to Cu-Zn-Al system, from elaboration to thermomechanical training and cycling (developed within Grant CNCSIS 476/ 2004-2005)
4. active elements from Cu-Zn-Al SMAs, under lamellar form, with critical temperatures between 100 and 200 0 C (developed within Grant CNCSIS 476/ 2004-2005)
5. hydraulic installation, for testing SMA sensors, equipped with thermoresistance, pressure transducer and data acquisition card (developed within Grant CNCSIS 476/ 2004-2005)
6. technology for embedding Cu-Zn-Al SMAs, trained in bending, into polymeric matrices (developed within Grant CNCSIS 275/ 2006-2007)
7. SMA/ elastomer microactuator (developed within Grant CNCSIS 275/ 2006-2007)
F. Member in editorial boards of international journals
Secretary of the Section Materials Science and Engineering of the Bulletin of the Polytechnic Institute of Iasi , ISSN 1453-1690
G. International collaborations
• Visiting scholar at the Chair of materials Science and Engineering, Ruhr University Bochum, within the Special Research Center SFB459-Shape Memory Technology, financed by the German Council of Research (DFG) and Nordrhein-Westfalen land, in time periods: (i) 3rd November – 1st December 2002 and (ii) 28th February-29th April 2005 ( see attached copies after chair's website and after collaboration agreement)
• Guest scientist at the Intelligent Materials Group, Laboratory of Innovative Materials Engineering, National Institute of Materials Science, (NIMS) Tsukuba , Japan in time periods: (i) 15th November – 15th December 2005 and (ii) 16th February – 17th March 2007 ( see attached copies after the confirmations addressed to TUIasi by NIMS)
• Collaboration agreement between the Department of Materials and Metallurgical Engineering, Laboratory of Particulate Materials, from Istanbul Technical University and the Faculty of materials Science and Engineering of the Technical University from Iasi, in view of performing common research in the field of shape memory alloys produced by Powder Metallurgy ( see attached copy ) |
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