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采用等径弯曲通道变形(Equal Channel Angular Pressing,ECAP)技术制备了不同晶粒尺寸的超细晶工业纯钛,通过纳米压痕测试技术对ECAP变形工业纯钛的力学性能进行研究,讨论了加载应变速率和晶粒尺寸对工业纯钛硬度测试结果的影响,进一步分析了ECAP变形工业纯钛的应变硬化能力和残余应力。结果表明:随着加载应变速率的增大和晶粒尺寸的减小,工业纯钛的硬度值增加。硬度-位移曲线表现出具有硬化效应的压痕尺寸效应(Indentation Size Effect,ISE)。纳米压痕形貌表明:ECAP变形工业纯钛的应变硬化能力降低,存在残余压应力。
The ultrafine grained pure titanium with different grain sizes was prepared by Equal Channel Angular Pressing (ECAP) technique. The mechanical properties of ECAP deformed pure titanium were studied by nanoindentation test. Strain rate and grain size on the hardness of industrial pure titanium test results, and further analysis of ECAP deformation of industrial strain hardening stress and residual stress. The results show that with the increase of strain rate and the decrease of grain size, the hardness of industrial pure titanium increases. The hardness-displacement curve shows an Indentation Size Effect (ISE) with a hardening effect. The nanoindentation morphology shows that the strain hardening ability of industrial pure titanium with ECAP deformation is reduced and residual compressive stress exists.