摘要
采用恒定拉伸速率等温拉伸法研究B Ti复合变质ZA2 7合金的超塑性及添加Mn和Ni的影响。借助SEM与XRD探讨Mn和Ni提高合金高温力学性能的机制。结果表明 ,2 2 0～ 2 80℃ ,拉伸机横梁移动速率 1～ 10 0mm/min条件下 ,合金具有超塑性 ,最佳变形条件下 ,延伸率达 75 0 %。Mn和Ni质量分数均各以 0 5 %为宜。加入Mn和Ni,合金高温强度提高 ,2 5 0℃ ,v=10 0mm/min时的超塑性拉伸流变应力提高 5 0 % ,而延伸率并未下降。
The superplasticity of ZA27 alloy modified with B-Ti and the effects of Mn and N i addition are investigated by means of the tensile testing under constant tempe rature and constant tensile speed. And the mechanism of the high temperature st r ength enhancement by Mn and Ni is expressed by SEM and XRD. The results show th a t the alloy has super plasticity at 220～280℃ and the crossbeam of tensile test in g apparatus moving at the speed of 1～100 mm/min, and the total elongation can r e ach to 750% under the optimum condition. The optimal additions of Mn and Ni are 0.5 %, respectively. The high temperature strength of the alloy is increased b y addition of Mn and Ni, the flowing stress of superplasticity tensile is increase d by 50% under the condition of 250℃ and v=100mm/min,but the elongation is not decreased.
出处
《有色金属》
CSCD
2004年第41期8-13,共6页
Nonferrous Metals
基金
河北自然科学基金资助项目 (5 992 3 6)
