Effect of heating-rate on failure temperature of pre-loaded magnesium alloy
(1. College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China;
2. Key Laboratory for Exploitation of Southwest Resources and Environmental Disaster Control Engineering,
Ministry of Education, Chongqing University, Chongqing 400044, China;
3. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)
2. Key Laboratory for Exploitation of Southwest Resources and Environmental Disaster Control Engineering,
Ministry of Education, Chongqing University, Chongqing 400044, China;
3. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)
Abstract: The response and failure of magnesium alloy AZ31 specimens subjected to different pre-loaded-stress levels and heating rates were investigated with a Gleeble−1500 thermo-mechanical material testing system. It is found that the increases of either pre-loaded stresses or heating-rates decrease the failure temperatures of the specimens. The metallographs of the tested specimens were also observed. It is shown that the high heating-rate may cause stronger local thermal inconsistency, which remarkably increases the microdefects and reduces the macroscopic mechanical properties of the material.
Key words: magnesium alloy AZ31; pre-loaded stress; heating rate; failure temperature; local thermal inconsistency