Kinetics of shear banding in a bulk metallic glass monitored by acoustic emission measurements

被引:42
作者
Vinogradov, AY [1 ]
Khonik, VA
机构
[1] Osaka City Univ, Dept Intelligent Mat Engn, Osaka 5588585, Japan
[2] State Pedag Univ, Dept Gen Phys, Voronezh 394043, Russia
关键词
D O I
10.1080/14786430410001678217
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Detailed acoustic emission ( AE) and surface microscopy investigations of the kinetics of shear banding in bulk Zr52.5Ti5Cu17.9Ni14.6Al10 metallic glass at room temperature are presented. The shear band propagates in a jump-like mode as reflected by numerous AE bursts. The time distribution and cluster statistical analysis of AE time series revealed, firstly, that there are two shear banding processes notably different in their spatial scales and, secondly, that formation of shear bands at large strains can be correlated in time and space. Independence of the AE characteristics on the current stress magnitude implies that shear band propagation could not be interpreted as a shear front motion in a viscous Newtonian-like medium. The AE response to shear banding is to a certain extent similar to that of a moving dislocation pile-up escaping to a free surface. It is emphasized that AE and microscopic features of shear banding in the bulk metallic glass are very nearly the same as those found earlier for melt-spun ribbon glasses, indicating that the change in the quenching rate by about four orders of magnitude does not cause the kinetics of shear band nucleation and propagation to vary considerably.
引用
收藏
页码:2147 / 2166
页数:20
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