A Tensile Deformation Model for In-situ Dendrite/Metallic Glass Matrix Composites

作者：Qiao, J. W.^*; Zhang, T.; Yang, F. Q.; Liaw, P. K.; Pauly, S.; Xu, B. S.

来源：Scientific Reports, 2013, 3: 2816.

DOI：10.1038/srep02816

• BULK METALLIC GLASSES
• STRAIN GRADIENT PLASTICITY
• ROOM-TEMPERATURE
• ENHANCED PLASTICITY
• TITANIUM-ALLOY
• DUCTILITY
• STRESS

In-situ dendrite/metallic glass matrix composites (MGMCs) with a composition of Ti46Zr20V12Cu5Be17 exhibit ultimate tensile strength of 1510 MPa and fracture strain of about 7.6%. A tensile deformation model is established, based on the five-stage classification: (1) elastic-elastic, (2) elastic-plastic, (3) plastic-plastic (yield platform), (4) plastic-plastic (work hardening), and (5) plastic-plastic (softening) stages, analogous to the tensile behavior of common carbon steels. The constitutive relations strongly elucidate the tensile deformation mechanism. In parallel, the simulation results by a finite-element method (FEM) are in good agreement with the experimental findings and theoretical calculations. The present study gives a mathematical model to clarify the work-hardening behavior of dendrites and softening of the amorphous matrix. Furthermore, the model can be employed to simulate the tensile behavior of in-situ dendrite/MGMCs.

• 出版日期2013-10-2
• 单位太原理工大学