摘要
对锻造态Ti-6Al-4V-4Zr-1.5Mo合金采用不同的热处理工艺得到等轴、双态和网篮3种组织。使用分离式Hopkinson Bar技术对3种组织的试样进行动态剪切试验,研究了不同微观组织对该合金绝热剪切敏感性的影响。结果表明:当加载条件高于其临界应变率时,不同组织试样的承载时间均随着应变率的提高而降低;微观组织对该合金的绝热剪切敏感性影响较大,网篮组织绝热剪切敏感性最低,双态组织绝热剪切敏感性最高;双态组织剪切带附近基体相界处出现微裂纹,是造成其易于发生剪切破坏的主要原因。
An examination of the effects of microstructures on the adiabatic shear banding sensitivity of Ti-6Al-4V-4Zr-Mo alloy was reported.Using the technology of split Hopkinson bar,the dynamic shearing experiments on Ti-6Al-4V-4Zr-Mo alloy with different heat treatments were conducted.The obtained microstructures are divided into the lamellar,the equiaxed and the bimodal according to heat-treatment conditions.The results indicate that the lamellar microstructure has the lowest adiabatic shear banding sensitivity,while the bimodal microstructure has the highest.In the bimodal microstructure,small cracks are found in the α/β interface located in the matrix region near the adiabatic shear band,which is considered as the main reason why the bimodal ones have the highest adiabatic shear banding sensitivity.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第1期45-48,共4页
Rare Metal Materials and Engineering
关键词
钛合金
组织
绝热剪切敏感性
应变率
titanium alloy
microstructure
adiabatic shearing sensitivity
strain rate