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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 3    March 2016

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Microstructural evolution in a powder metallurgicalTi-7Mo alloy with continuous oxygen gradient
CHENZhi-xing(陈智星)1, LIU Bin(刘彬)1, 2,LIU Yong(刘咏)1, ZENG Fan-pei(曾凡沛)2, LU Jin-zhong(卢金忠)2

1. State Key Laboratory of Powder Metallurgy (Central South University), Changsha 410083, China;
2. Fujian Longxi Bearing (Group) Corp., Ltd., Zhangzhou 363000, China

Abstract:A titanium alloy containing continuous oxygen gradient was prepared by powder metallurgy (P/M) and the composition–property relationship was studied on a single sample. The alloy was sintered with layered powder of different oxygen contents via vacuum sintering and spark plasma sintering (SPS), respectively. After subsequent heat treatments, high-throughput characterizations of the microstructures and mechanical properties by localized measurements were conducted. The Ti-7% Mo (molar fraction) alloy with an oxygen content ranging from 1.3×10-3 to 6.2×10-5(mass fraction) was obtained, and the effects of oxygen on the microstructural evolution and mechanical properties were studied. The results show that SPS is an effective way for fabricating fully dense Ti alloy with a compositional gradient. The average width of α′ phase coarsens with the increase of the content of oxygen. The content of α″ martensitic phase also increases with the content of oxygen. At oxygen contents of 3×10-3 and 4×10-3(mass fraction), the Ti alloys present the lowest microhardness and the lowest elastic modulus, respectively. The results also indicate that the martensitic phases actually decrease the hardness of Ti-7Mo alloy, and oxygen effectively hardens the alloy by solid solution strengthening. Therefore, the high-throughput characterization on a microstructure with a gradient content of oxygen is an effective method for rapidly evaluating the composition–property relationship of titanium alloys.

 

Key words: titanium alloys; oxygen; martensitic transformation; high-throughput method; powder metallurgy (P/M);mechanical properties

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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