Design and fabrication of a low modulus β-type Ti-Nb-Zr alloy by controlling martensitic transformation  

作　　者：Qing-Kun Meng Yu-Fei Huo Wen Ma Yan-Wei Sui Jin-Yong Zhang Shun Guo Xin-Qing Zhao 

机构地区：[1]School of Materials Science and Engineering,China University of Mining and Technology [2]GRINM Bohan (Beijing) Publisher Co.,Ltd.,GRINM Group Co.,Ltd. [3]School of Materials Science and Engineering,Jiangsu University [4]School of Materials Science and Engineering,Beihang University

出　　处：《Rare Metals》2018年第9期789-794,共6页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.51601217);the Natural Science Foundation of Jiangsu Province (No.BK20160255);the Fundamental Research Funds for the Central Universities (No.2017QNA04)

摘　　要：In this paper, high density of dislocations, grain boundaries and nanometer-scale α precipitates were intro- duced to a metastable Ti-36Nb-5Zr alloy （wt%） through a thermo-mechanical approach including severe cold rolling and short-time annealing treatment. The martensitic trans- formation was retarded, and the β phase with low content of β stabilizers was retained at room temperature after the thermo-mechanical treatment. As a result, both low mod- ulus （57 GPa） and high strength （950 MPa） are obtained. The results indicate that it is a feasible strategy to control martensitic transformation start temperature through microstructure optimization instead of composition design, with the aim of fabricating low modulus β-type Ti alloy.In this paper, high density of dislocations, grain boundaries and nanometer-scale α precipitates were intro- duced to a metastable Ti-36Nb-5Zr alloy （wt%） through a thermo-mechanical approach including severe cold rolling and short-time annealing treatment. The martensitic trans- formation was retarded, and the β phase with low content of β stabilizers was retained at room temperature after the thermo-mechanical treatment. As a result, both low mod- ulus （57 GPa） and high strength （950 MPa） are obtained. The results indicate that it is a feasible strategy to control martensitic transformation start temperature through microstructure optimization instead of composition design, with the aim of fabricating low modulus β-type Ti alloy.

关 键 词：Biomedical Ti alloys MARTENSITICTRANSFORMATION Low modulus Short-time annealing 

分 类 号：TG146.23[一般工业技术—材料科学与工程] R318.08[金属学及工艺—金属材料]