摘要
对未均匀化处理的AZ61合金进行了热挤压及不同制度的热处理,采用拉伸试验、硬度及电阻率测试、显微组织观察等方法研究了退火及时效热处理对挤压态AZ61合金力学性能的影响。结果表明:低温退火未使合金的抗拉强度下降,而高温退火使合金的抗拉强度明显降低;退火后的时效由于有少量第二相析出,能显著提高合金的屈强比,同时降低了塑性。此外,热挤压后的直接时效对合金的力学性能几乎没有影响。
An extruded AZ61 magnesium alloy was investigated by different techniques after various heat-treatment conditions. The mechanical properties of the treated alloy were obtained by tensile test and hardness measurement. The quantitative change of solution atoms was studied by electrical resistivity measurement. The experimental results show the annealing at 320 ℃ for lh after extrusion did not decrease the tensile strength but the exposure to 420 ℃ for lh decreased apparently, while the aging after annealing increased the yield/tensile strength with sacrifice of the elongation due to a few precipitates appear during the aging process, and the aging at 180 ℃ for 24h after extrusion made no difference to the strength.
出处
《铸造》
EI
CAS
CSCD
北大核心
2006年第9期903-906,共4页
Foundry
关键词
AZ61镁合金
热处理
热挤压
力学性能
AZ61 magnesium alloy
heat treatment
hot extrusion
mechanical property
