β型チタン合金(Ti-15V-3Cr-3Sn-3Al)時効材の衝撃強度
β型チタン合金(Ti-15V-3Cr-3Sn-3Al)時効材の衝撃強度
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β型钛合金(Ti-15V-3Cr-3Sn-3Al)时效材料冲击强度
DOI：
10.2472/jsms.46.118
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
欽也 小川
中科院分区：
文献类型：
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作者：
欽也 小川
β-钛合金（Ti-15V-3Cr-3Sn-3Al）作为（α+β）两相合金在723K时效6小时，在77K至673K的宽温度范围和10-4至103S-1的应变速率下的抗压强度得到了阐明。应用热激活应变率分析（TASRA）来表征变形机制。考虑绝热加热和应变率变化效应来预测高应变率下的应力应变关系，实验结果很有说服力。恒定移动位错密度下应力的应变率敏感性预测了高应变率范围内流变应力的温度和应变率依赖性，而相对低应变率范围内的变形行为则通过适当考虑移动位错密度的变化来理解。研究发现，对应于α相或β相的单一热激活过程分别在低温和高温下的变形行为中占主导地位，并且可以表征两相合金的整体特征。
Compressive strength of β-Titanium alloy (Ti-15V-3Cr-3Sn-3Al) aged at 723K for 6 hours, as (α+β) two-phase alloy, was clarified in a wide range of temperature from 77K to 673K and at strain rates from 10-4 to 103S-1. Thermally activated strain rate analysis (TASRA) was applied to characterize the deformation mechanism. Adiabatic heating and strain rate change effect were taken into account to predict the stress-strain relation at high strain rate, and the experimental results were well convincing. The strain rate sensitivity of stress under constant mobile dislocation density predicts the temperature and strain rate dependences of flow stress in the high strain rate range, while the deformation behaviour in the relatively low strain rate range is understood with due regard to the change of mobile dislocation density. It is found that a single thermally activated process corresponding to α or β phase predominates the deformation behaviour at low and high temperatures, respectively, and may characterize the two-phase alloy as a whole.