汽车用6061铝合金热压缩变形行为研究  

Study on hot compression deformation behavior of 6061 aluminum alloy for automobile

作　　者：张丽凤[1] ZHANG Li-feng(Vehicle Engineering Department,Shanxi Traffic Vocational and Technical College,Taiyuan 030031,China)

机构地区：[1]山西交通职业技术学院车辆工程系,山西太原030031

出　　处：《塑性工程学报》2020年第11期174-181,共8页Journal of Plasticity Engineering

基　　金：山西省重点研发计划项目(2017KKJH)。

摘　　要：在Gleeble-3500热模拟试验机上进行了均匀化态6061铝合金的热压缩变形,研究了变形温度为390~510℃、应变速率为1~20 s^-1时6061铝合金的热变形行为,建立了热变形本构方程和热加工图,分析了变形工艺参数对合金高温压缩行为的影响机制。结果表明,相同应变速率下,随着变形温度升高,6061铝合金的峰值应力逐渐减小;相同变形温度下,随着应变速率增加,6061铝合金的峰值应力逐渐增大。在变形温度为390~510℃、应变速率为1和20 s^-1时建立考虑应变补偿的流变应力本构方程可以较好地对6061铝合金的流变应力进行预测;6061铝合金在变形温度460~490℃、应变速率2~6.2 s^-1范围内不会发生流变失稳,且功率耗散因子较大,为适宜的热加工区域。Hot compression deformation of homogeneous 6061 aluminum alloy was carried out on Gleeble-3500 thermal simulator,the hot deformation behavior of 6061 aluminum alloy was studied at deformation temperature of 390-510 ℃ and strain rate of 1220 s^-1,the hot deformation constitutive equation and hot processing map were established,and the influence mechanism of deformation process parameters on high temperature compression behavior was analyzed. The results show that,at the same strain rate,the peak stress of 6061 aluminum alloy decreases gradually with the increase of deformation temperature;at the same deformation temperature,the peak stress of 6061 aluminum alloy increases gradually with the increase of strain rate. The established constitutive equation considering strain compensation can better predict the flow stress of 6061 aluminum alloy when the deformation temperature is 390-510 ℃ and the strain rate is 1-20 s^-1.The flow instability of 6061 aluminum alloy will not occur in the range of deformation temperature of 460-490 ℃ and strain rate of 2-6. 2 s^-1,and the power dissipation factor is larger,which is the suitable hot working area.

关 键 词：6061铝合金 变形温度 应变速率 本构方程 热加工图 

分 类 号：TG146.23[一般工业技术—材料科学与工程]