Title of article :
Criteria for tensile plasticity in Cu–Zr–Al bulk metallic glasses Original Research Article
Author/Authors :
S. Pauly، نويسنده , , G. Liu، نويسنده , , S. Gorantla، نويسنده , , G. Wang، نويسنده , , U. Kuhn، نويسنده , , D.H. Kim، نويسنده , , J. Eckert، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2010
Abstract :
(Cu0.5Zr0.5)100−xAlx (x = 5, 6, 8) bulk metallic glasses (BMGs) were deformed in tension. Besides ductility up to 0.5%, the material shows work-hardening behaviour. Both effects are attributed to the deformation-induced precipitation of B2 CuZr nanocrystals and the formation of twins in the nanocrystals larger than 20 nm. The precipitation of the nanocrystals alters the stress field in the matrix and is expected to retard shear band propagation, which in turn allows stresses in the nanocrystals to rise. This stress build-up is more severe in the larger grains and might be responsible for the subsequent twinning. Both deformation-induced nanocrystallization and twinning consume energy and avoid crack formation and with it premature failure.
Keywords :
Tensile tests , Ductility , Bulk metallic glasses , Martensitic transformation , Twinning
Journal title :
ACTA Materialia
Journal title :
ACTA Materialia