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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。
Forging Ti-6Al-4V-4Zr-1.5Mo alloy using different heat treatment process to obtain isometric, bimodal and basket three organizations. The dynamic Hopkinson Bar technique was used to conduct dynamic shear tests on three kinds of microstructures. The effects of different microstructures on the adiabatic shear properties of the alloys were investigated. The results show that when the loading condition is higher than the critical strain rate, the bearing time of different samples decreases with the increase of strain rate. The microstructure has a great influence on the adiabatic shear susceptibility of the alloy, The lowest shear sensitivity and the highest adiabatic shear susceptibility. The micro-cracks appeared near the bimetallic microstructure shear zone, which is the main reason for its easy shear failure.