Hypervelocity impact induced deformation modes in α-alumina

被引：27
作者：
Zhang, Cheng
Kalia, Rajiv K.
Nakano, Aiichiro
Vashishta, Priya [1 ]
机构：
[1] Univ So Calif, Dept Phys & Astron, Dept Chem Engn & Mat Sci, Los Angeles, CA 90089 USA
[2] Univ So Calif, Dept Comp Sci, Los Angeles, CA 90089 USA
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 07期
关键词：
D O I：
10.1063/1.2753092
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Hypervelocity impact deformation mechanisms of alpha-alumina are studied using 540x10(6) atom molecular dynamics simulation on massively parallel computers. The projectile impact on the (0001) surface of alpha-alumina at 18 km/s exhibits a fundamentally different symmetry of the deformation patterns from those under lower strain rates. The simulation reveals a sequence of atomistic deformation mechanisms following localized melting and amorphization. These include pyramidal slips, basal slips and twins, rhombohedral twins, and twins along the {0 (1) over bar 11}. Some of these deformation patterns are not observed under lower impact velocities. (C) 2007 American Institute of Physics.
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页数：3
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