应变率对TC4钛合金力学性能的影响

Effect of Strain Rate on the Mechanical Properties of TC4 Titanium Alloy

钛合金因其优异的综合性能,广泛应用在航空航天、化学、能源等领域。本文通过对原始TC4钛合金微观组织观察,分析钛合金微观组织对其力学性能的影响规律;将TC4钛合金压缩变形到30%,比较不同应变率下的应力-应变曲线;利用SEM对于压缩断口进行宏观、微观组织的观察。研究表明,TC4钛合金的压缩屈服强度与压缩速率成正比,TC4钛合金具有较好的应变速率敏感性;TC4钛合金的变形属韧性变形,随压缩速率的增加韧窝的大小和数量均减少,TC4材料的塑性降低。

Titanium alloys are widely used in aerospace,chemical,energy,and other fields due to their excellent comprehensive properties.This paper investigates the influence of microstructure on mechanical properties by observing the microstructure of original TC4 titanium alloy.It compares the stress-strain curves of TC4 titanium alloy deformed to 30%under different strain rates and examines the macroscopic and microscopic features of the compression fracture surfaces using SEM.The study shows that the compressive yield strength of TC4 titanium alloy is proportional to the compression rate,indicating good strain rate sensitivity.The deformation behavior of TC4 titanium alloy is ductile,with a reduction in the size and number of dimples as the compression rate increases,leading to a decrease in the material's plasticity.