Effect of Rhenium on the Dislocation Core Structure in Tungsten

被引：261
作者：
Romaner, Lorenz [1 ,2 ]
Ambrosch-Draxl, Claudia [2 ]
Pippan, Reinhard [1 ]
机构：
[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria
[2] Univ Leoben, Chair Atomist Modelling & Design Mat, A-8700 Leoben, Austria
来源：
PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 19期
关键词：
CENTERED-CUBIC METALS; BCC TRANSITION-METALS; SCREW DISLOCATIONS; AB-INITIO; 1ST-PRINCIPLES; DEFORMATION; ALLOYS; TA; MO;
D O I：
10.1103/PhysRevLett.104.195503
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Despite exhibiting the highest melting point of all metals, the technological use of tungsten is hampered by its room-temperature brittleness. Alloying with Re significantly ductilizes the material which has been assigned to modified properties of the 1/2 < 111 > screw dislocation. Using density functional theory, we show that alloying induces a transition from a symmetric to an asymmetric core and a reduction in Peierls stress. This combination ductilizes the alloy as the number of available slip planes is increased and the critical stress needed to start plastic deformation is lowered.
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页数：4
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