摘要
介绍了含钪铝合金中Al 3Sc/Al 3(Sc x,M 1-x)第二相粒子对裂纹萌生与扩展作用研究进展.Al 3Sc/Al 3(Sc x,M 1-x)第二相粒子具有三种尺度,微米级、纳米级和亚微米级,粗大的Al 3Sc/Al 3(Sc x,M 1-x)粒子可以成为裂纹源,降低疲劳性能;纳米级的Al 3Sc/Al 3(Sc x,M 1-x)粒子通过提升合金强度,钉扎位错和亚晶界,从本质上降低裂纹萌生的几率,还可以通过改善其它粗大粒子的析出和分布来改善疲劳性能.在对疲劳裂纹扩展的作用上,Al3Sc/Al3(Sc x,M 1-x)第二相粒子总体上对疲劳性能的提升是有利的,可以降低裂纹扩展速率.同时还对裂纹扩展的计算方法进行了综述,认为计算方法是研究Al 3Sc/Al 3(Sc x,M 1-x)第二相粒子在裂纹萌生与扩展作用方面的一种行之有效的方法.
The research progress of Al 3Sc/Al 3(Sc x,M 1-x)in scandium-containing aluminum alloy on crack initiation and propagation is presented.Al 3Sc/Al 3(Sc x,M 1-x)particles have three scales,micron,nanoscale,and submicron levels.Coarse Al 3Sc/Al 3(Sc x,M 1-x)particles can become crack sources and reduce fatigue properties;nano-sized Al 3Sc/Al 3(Sc x,M 1-x)particles can essentially reduce the crack initiation probability by lifting the alloy strength,pinning dislocations and sub-crystal boundaries,and also improve fatigue performance by improving precipitation and distribution of other coarse particles.In the action of fatigue crack growth,Al 3Sc/Al 3(Sc x,M 1-x)are generally beneficial to the improvement of fatigue performance,which can reduce the crack growth rate.The calculation method of crack propagation is also reviewed,and it is considered that the calculation method is an effective method to study the effect of Al 3Sc/Al 3(Sc x,M 1-x)on crack initiation and propagation.
作者
陈显明
范莹莹
CHEN Xianming;FAN Yingying(School of Electronic and Electrical Engineering,Zhaoqing University,Zhaoqing 526061,China)
出处
《材料研究与应用》
CAS
2020年第4期330-335,共6页
Materials Research and Application
基金
国家自然科学基金项目(51402258)。
