微观组织因素对Ti-6Al-4V-4Zr-Mo合金绝热剪切行为的影响(英文)

Effects of Microstructural Factors on Adiabatic Shear Behaviors of Ti6441 Alloys

针对Ti-6Al-4V-4Zr-Mo(Ti6441)合金采用不同的热处理工艺得到等轴和片层2种微观组织,使用分离式Hopkinson Bar技术对2种组织的试样进行动态剪切试验,研究微观组织对该合金绝热剪切敏感性的影响。结果表明:相同加载条件下,片层组织绝热剪切敏感性较等轴组织低;2种组织动态强度接近,但片层组织较等轴组织具有更好的动态延展性;片层组织试样中的绝热剪切带出现分叉现象,从而可以消耗更多的变形能。

In term of newly developed titanium alloys Ti-6Al-4V-4Zr-Mo （Ti6441） modified from the commercial Ti-6Al-4V alloys, the adiabatic shear behaviors of equiaxed and lamellar microstructures were investigated. Unlike the Ti-6Al-4V alloys, Ti6441 alloys with the lamellar microstructure are less susceptive to adiabatic shear bands （ASBs）, compared with the equiaxed one. In particular, the ASBs branch off in the lamellar microstructure, requiring additional energy by consuming metal bulk plastic deformation work. Besides, forced shearing experiment results show the lamellar microstructure exhibits outstanding dynamic ductility in contrast with the equiaxed one, though both microstructures perform the same strength value.