Effect of Rolling Process on Microstructures and Mechanical Properties of High Strain-Rate Rolled ZK60 Magnesium Alloy

A high strain-rate rolling (HSRR) process was successfully used to produce a ZK60 magnesium alloy sheet with a strength-toughness balance. In one-pass rolling, as the rolling rate increases, the edge cracking of the sheets decreases and the grain size increases continuously, and the grain size ranges from 1.4 μm at 5 s–1 to 4.2 μm at 25 s–1. When the strain rate is 5 s–1, the tensile strength and elongation of the ZK60 magnesium alloy are 355 MPa and 12.40%, respectively. As the rolling rate increases, the tensile strength decreases from 355 to 310 MPa. When the rolling rate is less than 20 s–1, the texture strength decreases with the strain rate, from 9.064 at 5 s–1 to 4.480 at 20 s–1, but when the strain rate is 25 s–1, the texture increases to 7.099. At the same time, the study also found that the two-pass rolling process can weaken the texture and increase the tensile strength. The texture strength decreased from 9.04 in a one-pass rolling process to 8.528, and the tensile strength increased from 355 MPa in a one-pass rolling process to 377 MPa.