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利用分离式Hopkinson动态压缩装置对添加0.03%Y2O3(质量分数,下同)的细晶93W-4.9Ni-2.1Fe合金试样进行动态力学性能测试,观察分析了动态压缩后合金试样的显微组织。结果表明:在应变速率为1900s-1下,合金沿着与冲击方向成45o的方向形成了明显的绝热剪切带,宽度10～25μm。说明该合金对局部绝热剪切的敏感性大大提高且能在相对较低的应变速率下发生绝热剪切。同时位于剪切带中心区域的钨颗粒沿着其扩展方向被剧烈拉长成纤维状,表现出塑性流动局域失稳的特征。
The dynamic mechanical properties of fine grained 93W-4.9Ni-2.1Fe alloy with addition of 0.03% Y2O3 (mass fraction, the same below) were tested by a separate Hopkinson dynamic compression device. Microstructure of the samples after dynamic compression was observed and analyzed. organization. The results show that at strain rate of 1900s-1, the alloy forms obvious adiabatic shear bands with a width of 10 ~ 25μm along the direction of 45o. Indicating the sensitivity of the alloy to locally adiabatic shear is greatly improved and adiabatic shear can occur at a relatively low strain rate. At the same time, the tungsten particles located in the central region of the shear zone are strongly elongated in the form of fibers along the expanding direction, which shows the local instability of plastic flow.