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1900 s-1下,合金沿着与冲击方向成45°的方向形成了明显的绝热剪切带,宽度10～25 μm.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.
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