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生物醫(yī)用Ti-29Nb-13Ta-5Zr合金的超塑性行為
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南京航空航天大學人才引進基金（S0565）


Superplasticity Behavior of Ti-29Nb-13Ta-5Zr for Biomedical Application
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    摘要:

    采用拉伸速率突變法，研究Ti-29Nb-13Ta-5Zr(Ti-29-13)合金冷軋后在700~800 ℃和5′10-4~1′10-2 s-1應變速率范圍內(nèi)的高溫變形行為和變形機制，并與典型β鈦合金Ti-15V-3Cr-3Sn-3Al(Ti-15-3)進行比較。結果顯示兩種合金中均出現(xiàn)了非連續(xù)屈服現(xiàn)象，Ti-29-13合金的亞晶行為不同于Ti-15-3合金。Ti-29-13合金的延伸率低于Ti-15-3合金，應力指數(shù)n幾乎恒定為3.3，變形激活能為152~161 kJ/mol；Ti-15-3合金在730 ℃以上的n值為2.3~2.5，變形激活能為173~176 kJ/mol。

    Abstract:

    Incremental step strain-rate test in the temperature range of 700-800 oC and the strain rate range of 5′10-4–1′10-2 s-1 were conducted for investigation of high temperature deformation behavior of Ti-29Nb-13Ta-5Zr (Ti-29-13), as well as another typical β titanium alloy Ti-15V-3Cr-3Sn-3Al (Ti-15-3). Results show there exist discontinuous yielding phenomenon in both alloys and the subgrain behavior is different between them. The strain to failure of Ti-29-13 is lower than that of Ti-15-3. In the deformation of Ti-29-13, the stress exponent is near 3.3, which is almost constant, and the deformation activation energy is 152-161 kJ/mol; while in the deformation of Ti-15-3, the stress exponent at the temperatures higher than 730 oC is 2.3-2.5, and the deformation activation energy is 173-176 kJ/mol.

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張方哲,周 清,童國權,陳明和,陶克梅.生物醫(yī)用Ti-29Nb-13Ta-5Zr合金的超塑性行為[J].稀有金屬材料與工程,2011,40(2):231~235.[Zhang Fangzhe, Zhou Qing, Tong Guoquan, Chen Minghe, Tao Kemei. Superplasticity Behavior of Ti-29Nb-13Ta-5Zr for Biomedical Application[J]. Rare Metal Materials and Engineering,2011,40(2):231~235.]
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  • 收稿日期:2010-03-01
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