中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 Special 2 July 2010 |
（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）
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
