组织与性能的影响
(1. 北京有色金属研究总院， 北京 100088；
2. 西南铝业（集团）有限责任公司， 重庆 401326)
摘 要: 采用正交试验和模拟试验的方法， 研究了在线淬火方式、 淬火冷却速度及淬火延迟时间对6005A铝合金空心型材组织和性能的影响。 结果表明： 提高在线淬火冷却强度比提高挤压温度和挤压速度对改善型材性能的效果更明显，型材强度随淬火冷却速度的增大明显提高， 而延伸率并无明显降低； 在线精密水雾淬火可使型材性能满足车辆型材使用要求； 缩短在线淬火前型材在室温环境下的停留时间，可以显著提高型材强度性能。
关键字: 6005A合金； 在线淬火； 性能； 挤压
mechanical properties of 6005A alloy extrusion sections
（1. General Research Institute for Nonferrous Metals,
Beijing 100088, China;
2. Southwest Aluminium (Group) Co. Ltd,
Chongqing 401326, China）
Abstract:Effects of the type of press quenching, the cooling velocity and the delay time before press run-out quenching on the microstructures and mechanical properties of Al-Mg-Si (6005A) hollow sections were investigated by orthogonal optimizing method. The results indicate that the increase of cooling rate of the extrusion profiles during press quenching, rather than preheating temperature and extrusion speed, leads to significant improvement of the ultra-strengths of the sections with limited diminishing to the elongation, while the shortened delay time before press quenching favors the increase of strength of the sections considerably. The mechanical properties of the 6005A sections intensively water-spray quenched can meet the commercial application requirements for vehicle and transportation industries.
Key words: 6005A alloy; press quenching, ; mechanical property; extrusion
