Impact strength of titanium alloys.
Impact strength of titanium alloys.
复制标题
钛合金的冲击强度。
DOI：
10.2472/jsms.37.1171
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
T. Nojima
中科院分区：
文献类型：
--
作者：
K. Ogawa;T. Nojima
研究了两种钛合金在78K ~ 723K宽温度范围和10-4/sec ~ 103/sec应变速率范围内的抗压强度。研究发现，流变应力随应变速率的升高和温度的降低而增大，而与温度和应变速率历史完全无关。用热活化过程的概念分析了应力的热分量（σ*），并在较低应变速率范围内仅用Larson-Millar参数ξ*=Tln（e0/e）进行了表征。应力的非热分量（σμ）仅是应变的函数，因此可以预测在给定温度和应变速率下的整个应力-应变关系。考虑绝热产生引起的温度变化来评估高应变速率下的应力，并对实验结果提供了合理的解释。
The compressive strength of two kinds of titanium alloys was investigated in the wide temperature range from 78K to 723K and the strain rate range from 10-4/sec to 103/sec. It was found that the flow stress increased with the rise of strain rate and with the decrease of temperature, while it was completely independent of temperature and strain rate history.The thermal component of the stress, ≅σ*, was analysed with the thermally activated process concept and was uniquely characterized only with the Larson-Millar parameter ξ*=Tln(e0/e) in the relatively low strain rate range. The athermal component of the stress, ≅σμ, was a function of strain only and consequently the whole stress-strain relation at a certain given temperature and strain rate can be predicted.The temperature change due to the adiabatic heat generation was taken into account to evaluate the stress at high strain rates and provided a plausible explanation of the experimental results.