利用表面机械研磨处理(SMAT)技术在Zr片状拉伸样品表面施加剧烈变形,获得超细/纳米晶粒组织的变形细化表层,其中Zr板厚度1 mm,两侧变形层厚度均为100μm.拉伸实验结果表明,表层细化组织提高了屈服强度和抗拉强度,使加工硬化能力及伸长率下降.应变速率在10-4～10-3s-1范围时,拉伸强度随应变速率的提高而提高;应变速率增大至10-2s-1量级时,抗拉强度下降.扫描电镜观察显示出韧性韧窝状断裂特征.
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