Dynamic deformation and failure behaviour of Al-Sc alloy under shear loading

被引：0
|
作者：
Lee, W. S. [1 ]
Lin, C. F.
Lin, Y. C.
机构：
[1] Natl Cheng Kung Univ, Dept Mech Engn, Tainan 70101, Taiwan
[2] Natl Ctr High Performance Comp, Hsinchu 744, Tainan Cty, Taiwan
来源：
JOURNAL DE PHYSIQUE IV | 2006年 / 134卷
关键词：
D O I：
10.1051/jp4:2006134147
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The dynamic shear deformation behaviour and fracture characteristics of Al-Sc alloy are studied using a split-Hopkinson torsional bar at shear strain rates of 800 s(-1), 1800 s(-1) and 2800 s(-1) And temperatures of -150 degrees C, 25 degrees C and 300 degrees C. The experimental results indicate that the shear strain, shear strain rate and temperature all have a significant influence on the mechanical properties of the alloy. The fracture surfaces of the gauge length section of the deformed specimen are twisted into band-like features as a result of intensive localized shear deformation. The width and microhardness of the shear band changes with strain rate and temperature as a result of different work hardening effects. Specimen fracture initiates at the Al3Sc precipitate/matrix interface. The presence of precipitates accelerates the dynamic shear fracture formation via microcracking.
引用
收藏
页码：965 / 970
页数：6
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