The effect of strain rates on tensile deformation of ultrafine-grained copper

作者：Li, M.; Jiang, Q. W.^*

来源：International Journal of Modern Physics B, 2017, 31(16-19): 1744014.

DOI：10.1142/S0217979217440143

• Strain rate
• flow stress
• fracture morphology
• tensile deformation
• UFG copper

Tensile deformation behavior of ultrafine-grained (UFG) copper processed by accumulative roll-bonding (ARB) was studied under different strain rates at room temperature. It was found that the UFG copper under the strain rate of 10(-2) s(-1) led to a higher strength (higher flow stress level), flow stability (higher stress hardening rate) and fracture elongation. In the fracture surface of the sample appeared a large number of cleavage steps under the strain rate of 10(-3) s(-1), indicating a typical brittle fracture mode. When the strain rate is 10(-2) or 10(-1) s(-1), a great amount of dimples with few cleavage steps were observed, showing a transition from brittle to plastic deformation with increasing strain rate.

• 出版日期2017-7-30
• 单位昆明理工大学