• CHEN Rongshi
    Title:Professor Email: rschen@imr.ac.cn
    Tel. : +86-24-23926646 FAX: +86-24-23894149
    Division: Environmental Corrosion Research Centre
    Address: Environmental Corrosion Research Centre, Institute of Metal Research Chinese Academy of Sciences (IMR CAS), 62 WenCui Road, Shenyang, China, 110016

Experience:

Prof. Chen received his B.S. from Shenyang Ligong University in 1989 and received his Ph.D. degree in 1999.04 (jointly supervised by Dalian university of technology and institute of metal research (IMR), Chinese academy of sciences). And his Ph.D thesis focused on strengthening and toughening mechanism of NiAl intermetallic compounds. From 2000 to 2003, he has been engaged in the research of magnesium alloy and its processing technology in Pohang University of Science and Technology, Ben Gurion University and Institute of National Polytechnic of Grenoble, successively. In 2003, he was selected as “One Hundred Talented People” of The Chinese Academy of Sciences and started to establish the magnesium alloy research group in IMR. Up to now, he has accomplished more than 20 research programs funded by Hi-Tech Research and Development Program of China (863 Program), Chinese Nature Science Foundation program, the National Basic Research Program of China (973 Program), Boeing and GM, etal. And the magnesium alloy research group of IMR has gone into cooperations with abroad magnesium alloy research and development associations from Germany, Australia, America, Canada, Japan, Israel and South Korea. Besides, he has already tutored 10 doctoral students, and they have shown strong competitive in job market. During the year 2008 to 2014, he has published about 100 SCI papers in the field of Mg alloy, which received more than 1000 citations. And he has filed 18 patents (including 2 US patents), 13 of which has been authorized.

Research Interest:

1) Development of new magnesium alloys with excellent formability and mechanical properties

2) Microstructure and performance characterization of magnesium alloys including fatigue, creep and interaction with environment,

3) Advanced forming processing and manufacturing technology of magnesium alloys including casting and plastic forming technologies.

Research Achievement:

1. With the help of Pandat thermomechanical calculation software and thermal analysis techniques, the solidification pathways and microstructure formation procedure of Mg-Al-Ca, Mg-Zn-Y and Mg-Al-Zn alloys were investigated, the relationships between dendrite coherency temperature, solid fraction and grain size of these alloys were revealed, and the formation mechanism of coarse dendrites in cast Mg alloys were composed. Discovered the formation mechanism of some casting defects(Fig.1) in Mg alloy castings, including hot tearing and shrinkage porosity. And proposed the metallurgical principles for casting process design including moulding technique, pouring system design, risering system design, cooling rate controlling, etal.

Fig.1 A study on hot tearing and its mechanisms related to solidification thermodynamic

2. Proposed and actualized the academic viewpoint of improving the room temperature ductility and formability of Mg alloys rolled sheets with methods of weakening the peak texture strength, increasing the texture tilting angle, inhibiting {10-11}<10-12> compression twining, stimulating basal slip and {10-12}<10-11> tension twining(Fig.2).

Fig.2  microstructure in a magnesium alloy and mechanisms for room-temperature deformation

3. Firstly detected and reported the abnormally high strengthening effect and texture weakening effect of RE on Mg alloys. Revealed the effects of RE (Gd, Y) on high temperature deformation, dynamic recrystallization and static recrystallization of Mg alloys. Demonstrated the influence mechanism of high temperature deformation texture on the strength, ductility and formability of Mg alloys(Fig.3).

Fig.3 mechanisms for high temperature deformation and texture weakening in a magnesium alloy

4. Developed high-strength G04 Mg alloys and its forming technologies which has been applied widely on spacecrafts, and satellites. Almost one thousand components of these spacecrafts have been produced with G04 Mg alloys, resulting in a weight loss of more than 100kg for these spacecrafts.

5. Developed a complete set of techniques for industrial production of Mg alloy castings, such as refining technology, on-site thermal analysis technique, cooling rate controlling method for sand casting, heat treatment process for super-large Mg alloy castings. By applications of these technologies, a super-large (880mm×500mm×500mm), thin-walled, hollow component was produced. The component has satisfied with the customer's requirement of internal metallurgical quality, mechanical property, dimensional accuracy and part weight, and has been installed on the rocket.

6. Produced rolled Mg-Gd-Zn alloy sheets (with registered trademark “SuperDucMg”) with excellent room-temperature ductility and formability through conventional rolling technology. The sheets exhibit a large elongation-to-failure of 43% at room temperature (Fig.4) and the capability to be deep drawn at room temperature (Fig.5). Thus broke the technological bottleneck of plastic forming for Mg alloys at room temperature. This research achievement was selected as one of the 10 scientific and technological advances by The Chinese Society of Rare Earths, and the related technology has been transferred to enterprises for practical production.

 

Fig.4 Typical tensile curves of high room-temperature ductility in a novel Mg alloy sheet

Fig. 5 Picture of the Super-ductility Mg alloy sheets

Service to the International Professional Societies:

Honors:

Publication:

1) Jiang, M. G.; Yan, H.; Chen, R. S, Enhanced mechanical properties due to grain refinement and texture modification in an AZ61 Mgalloy processed by small strain impact forging; MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Vol: 621 Pp: 204-211: JAN 5 2015

2) Luo, Jun; Yan, Hong; Chen, Rong-Shi; Effects of Gd concentration on microstructure, texture and tensile properties of Mg-Zn-Gd alloyssubjected to large strain hot rolling; MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Vol: 614 Pp: 88-95: SEP 22 2014

3) Wu, D.; Chen, R. S.; Ke, W; Microstructure and mechanical properties of a sand-cast Mg-Nd-Zn alloy; MATERIALS & DESIGN Vol: 58 Pp: 324-331: JUN 2014

4) Hou Danhui; Liang Songmao; Chen Rongshi; SOLIDIFICATION BEHAVIOR AND GRAIN SIZE OF SAND CASTING Mg-6Al-xZn ALLOYS; ACTA METALLURGICA SINICA ; Vol:: 50 No: 5 Pp: 601-609 ; : MAY 11 2014

5) Li, Jilin; Chen, Rongshi; Ma, Yuequn; Hot Tearing of Sand Cast Mg-5 wt.% Y-4 wt.% RE (WE54) Alloy; ACTA METALLURGICA SINICA-ENGLISH LETTERS Vol: 26 No: 6 Pp: 728-734; DEC 2013

6) Yan, H, Chen, RS, Zheng, N, et al., Effects of trace Gd concentration on texture and mechanical properties. Journal of Magnesium and alloys, Vol.1, No.1,2013, P23-30

7) Yan, H, Xu, SW, Chen, RS, et al., Activation of {10-12} twinning and slip in high ductile Mg-2.0Zn-0.8Gd rolled sheet with non-basal texture during tensile deformation at room temperature. Journal Of Alloys and Compound, Vol.566,No.25,2013,P98-107

8) Shi, BQ, Chen, RS, Ke, W, Effects of yttrium and zinc on the texture, microstructure and tensile properties of hot-rolled magnesium plates, Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing, Vol.560, 2013, P62-70

9) Li, SQ, Tang, WN, Chen, RS, et al., Effect of Rolling Reduction on Microstructure and Mechanical Properties of Mg-9Gd-3Y-0.5Zr Alloys. Materials Science Forum, Vol.747-748,2013,P223-229

10) Li, JL, Ma, YQ, Chen, RS, et al., Effects of Shrinkage Porosity on Mechanical Properties of a Sand Cast Mg-Y-RE (WE54) Alloy. Materials Science Forum, Vol.747-748,2013,P390-397

11) Wu, D, Chen, RS, Tang, WN, et al., Influence of texture and grain size on the room-temperature ductility and tensile behavior in a Mg-Gd-Zn alloy processed by rolling and forging, Materials & Design, Vol.41,2012,P306-313

12) Shi, BQ, Chen, RS, Ke, W, Effects of forging processing on the texture and tensile properties of ECAEed AZ80 magnesium alloy, Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing, Vol.546,2012,P323-327

13) Wu, D, Chen, RS, Han, EH, Serrated flow and tensile properties of a Mg-Gd-Zn Alloy, Materials Science And Engineering A-Structural Materials Properties Microstructure And Processing, Vol.532,2012,P267-274

14) Song, YW, Shan, DY, Chen, RS, et al,. Corrosion resistance of Mg-8.8Li alloy compared with AZ91, Corrosion Engineering Science And Technology, Vol.46,No.6,2011,P719-723

15) Gao, L, Chen, RS, Han, EH, Thixoformability of a Mg-Gd-Y magnesium alloy and its mechanical properties, Materials Science and Technology, Vol.27, No.6, 2011, P1084-1091

16) Shi, BQ, Chen, RS, Ke, W, Effects of processing route on texture and mechanical properties of WZ62 alloy, Transactions of Nonferrous Metals Society of China, Vol.21, No.4, 2011, P830-835

17) Gao, L, Chen, RS, Han, EH, Enhancement of ductility in high strength Mg-Gd-Y-Zr alloy, Transactions Of Nonferrous Metals Society Of China, Vol.21,No.4,2011,P863-868

18) Gao, L, Zhou, J, Sun, ZM, Chen, RS, et al., First-principles calculations of the beta'-Mg7Gd precipitate in Mg-Gd binary alloys, Chinese Science Bulletin, Vol.56, No.11, 2011, P1142-1146

19) Gao, L, Zhou, J, Sun, ZM, Chen, RS, et al., Electronic origin of the anomalous solid solution hardening of Y and Gd in Mg: A first-principles study, Chinese Science Bulletin, Vol.56,No.10,2011, P1038-1042

20) Yan, H, Chen, RS, Han, EH, A comparative study of texture and ductility of Mg-1.2Zn-0.8Gd alloy fabricated by rolling and equal channel angular extrusion, Materials Characterization, Vol.62,No.3,2011,P321-326

21) Shi, BQ, Chen, RS, Ke, W, Solid solution strengthening in polycrystals of Mg-Sn binary alloys, Journal of Alloys And Compound, Vol.509,No.7,2011, P3357-3362

22) Wu, D, Chen, RS, Han, EH, Excellent room-temperature ductility and formability of rolled Mg-Gd-Zn alloy sheets, Journal of Alloys And Compound, Vol.509, No.6, 2011, P2856-2863

23) H, Yan,Xu, SW,Chen, RS,et al., Twins, shear bands and recrystallization of a Mg-2.0%Zn-0.8%Gd alloy during rolling. Scripta Materialia,Vol.64,No.2, 2011, P141-144

24) Yan, H, Chen, RS, Han, EH, Room-temperature ductility and anisotropy of two rolled Mg-Zn-Gd alloys. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol. 527, 2010, P15

25) Gao, L, Chen, RS, Han, EH, Effects of rare-earth elements Gd and Y on the solid solution strengthening of Mg alloys. Journal of Alloys and Compounds, Vol. 481, No. 1-2, 2009, P379-384

26) Gao, L, Chen, RS, Han, EH, Solid solution strengthening behaviors in binary Mg-Y single phase alloys. Journal of Alloys and Compounds, Vol. 472, No. 1-2, 2009, P234-240

27) Huang, ZH, Liang, SM, Chen, RS, et al., Solidification pathways and constituent phases of Mg-Zn-Y-Zr alloys. Journal of Alloys and Compounds, Vol. 468, No. 1-2, 2009, P170-178

28) Tang, WN, Chen, RS, Zhou, J, Effects of ECAE temperature and billet orientation on the microstructure, texture evolution and mechanical properties of a Mg-Zn-Y-Zr alloy. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol. 499, No. 1-2, 2010, P404-410

29) Liu, XB, Chen, RS, Han, EN, Effects of ageing treatment on microstructures and properties of Mg-Gd-Y-Zr alloys with and without Zn additions. Journal of Alloys and Compounds, Vol. 465, No. 1-2, 2008, P232-238

30) Liang, SM, Chen, RS, Blandin, J.J, Thermal analysis and solidification pathways of Mg-Al-Ca system alloys. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol. 480, No. 1-2, 2008, P365-372

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