ZMl Mg合金的表面滚压强化SCIEI

研究了表面滚压对ＺＭ１Ｍｇ合金疲劳强度和疲劳缺口敏感度的影响。结果表明，滚压可使其光滑疲劳极限提高５７％，缺口疲劳极限提高２００％，大大降低疲劳缺口敏感度，使ｑ出现负值。ｈｃｐ的ＺＭ１Ｍｇ合金滚压时以滑移和孪生方式变形和形变强化，引入高的残余压应力，有利于提高缺口疲劳极限和降低疲劳缺口敏感度。

SURFACE ROLLING STRENGTHENING OF Mg ALLOY ZMl

The effect of surface rolling on fatiuge strength and fatigue sensitivity to notch of the Mg alloy ZM1 has been studied. Results showed that the increase in smooth or notohed fatigue limit amounts to 57 or 200% respectively. The fatigue sensitivity to notch may be greatly reduced,and so the q value may become negative. During surface rolling of hcp Mg alloy,the plastic deformation and strengthening may be carried out by the way of slip and twin.The high compressive residual stress is favourable to improve the notched fatigue hmit and to modify the fatigue sensitivity to notch. The plastic deformation strengthening may contribute to develop the benificial behaviour of the compressive residual stress.