Tension behavior of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si alloy over a wide range of strain rates

Tension behavior of Ti–6.6Al–3.3Mo–1.8Zr–0.29Si alloy over a wide range of strain rates
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Ti~6.6Al~3.3Mo~1.8Zr~0.29Si合金在宽应变率范围内的拉伸行为

DOI:
10.1016/j.matlet.2014.03.042
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发表时间:
2014-06
期刊:
影响因子:
3
通讯作者:
Yang Wang
Yang Wang
中科院分区:
材料科学3区
文献类型:
--
作者:
Jun Zhang;Yang Wang

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研究了应变速率对Ti-6.6Al-3.3Mo-1.8Zr-0.29Si合金拉伸应力-应变响应的影响,应变速率范围为0.001至940 s-1。拉伸屈服强度随应变速率的增加而增加。在中等速率加载条件下,流变应力存在速率敏感性的转变。应变速率对初始屈服行为的影响大于应变硬化行为。SEM观察表明,合金以韧性断裂方式断裂,韧窝尺寸随应变速率的增加而减小。提出了一个基于唯象的本构模型来描述率相关拉伸行为。在所测试的应变率范围内,模型关联式与实验数据吻合良好。
The effect of strain rate on the tension stress–strain responses of the Ti–6.6Al–3.3Mo–1.8Zr–0.29Si alloy are investigated at strain rates ranging from 0.001 to 940 s−1. The values of tension yield strength increase with increasing strain rate. There exists the transition of rate sensitivity for flow stress under moderate-rate loading conditions. Moreover, strain rate has greater influence on the initial yielding than the strain hardening behavior. SEM observation shows that the alloy is broken in a manner of ductile fracture and the dimple size decreases with the increase of strain rate. A phenomenologically-based constitutive model is proposed to describe the rate-dependent tension behavior. The model correlations are in good agreement with the experimental data within the tested strain-rate range.
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发表时间: 2003-11
期刊: Metallurgical and Materials Transactions A
影响因子: --
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