RESISTANCE OF GRAIN BOUNDARIES TO FATIGUE CRACK GROWTH IN HIGH STRENGTH AIALLOYS

摘要：

Resistance to short fatigue crack growth across grain boundaries was identified to be due to twist and tilt of crack plane deflection across the boundaries in some Al-Li and Al-Cu alloys.It counted for the commonly observed anomalous behaviors of short fatigue crack growth across grain boundaries.It could be explained why a finer layered grain structure with a strong β fiber texture exhibited faster growth rate of a fatigue crack than that in a coarse fibril grain structure of the same alloy.The grain orientation also had a strong effect on crack initiation and early growth in these alloys.

关键词： Crack deflection Crack growth resistance Texture effects Crack planetwist and tilt Al alloys

作者: T.Zhai J.C.Li X.P.Jiang G.H.Bray

作者单位: Dept.of Chemical and Materials Engineering,University of Kentucky,KY 40506,USA Alcoa Technical Center,100 Technical Drive,Alcoa Center,PA 15069,USA

会议类型: 国际会议

会议名称: 第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)

会议地点: 安徽黄山

会议语种:英文

页码: 423-427

在线出版日期: 2008-06-03（万方平台首次上网日期，不代表论文的发表时间）