Peculiar aging response of near b Ti–25 Nb–2Mo–4Sn alloy
for biomedical applications |
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作者姓名: | Shun Guo Bin Chen Qingkun Meng Ruiwen Zhao Xinqing Zhao |
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作者单位: | School of Materials Science and Engineering,Beihang University |
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基金项目: | supports from the National Natural Science Foundation of China (No. 51271010);the National Natural Science Fund for innovative research groups (No. 51221163);the National Basic Research Program of China (No.2012CB619403) |
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摘 要: | In this paper,aging response of a recently developed near β Ti-25Nb-2Mo-4Sn(wt%) alloy with high strength and low modulus was investigated intensively.The experimental results from X-ray diffraction and transmission electron microscopy showed that the aging production of the Ti-2524 alloy was(β+ω) or(β+α) even under the same aging treatment condition,depending on the pre-treatments prior to the aging.Solid evidence confirmed the competition between stable α phase and metastable ω phase during the decomposition of β phase on aging.Different aging response of Ti-2524 alloy can be attributed to high-density dislocations and grain boundaries which suppress the formation of ω,and alternatively promote a phase formation.This provides a thermo-mechanical approach to inhibit deleterious ω phase formation and assist fine α phase precipitation.Upon an appropriate aging treatment,superior mechanical properties of high ultimate tensile strength(1233 MPa) and low elastic modulus(77 GPa) were achieved in Ti-2524 alloy.
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关 键 词: | Near β titanium alloy Phase transformation Mechanical properties High strength Low modulus |
收稿时间: | 25 July 2012 |
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