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采用Gleeble-3500热/力动态模拟试验机研究了AZ91镁合金在变形温度为250～400℃、应变速率为10-3～1 s-1条件下的热压缩变形行为。并在此基础上,采用Gleeble-3500模拟累积叠轧焊轧制方法,对其在累积叠轧焊(ARB)过程中的组织演变和晶粒细化的机制进行了研究。结果表明:AZ91镁合金在热压缩变形过程中,适宜的变形工艺为变形温度350～400℃、应变速率10-3～10-2 s-1。AZ91镁合金在变形温度350℃、应变速率0.01 s-1和变形量80%为工艺条件的累积叠轧焊过程中,晶粒在第一次轧制过程中明显细化,其机制发生了动态再结晶,在随后的叠轧过程中,晶粒细化程度有限,但组织均匀程度增加。
The hot compressive deformation behavior of AZ91 magnesium alloy under deformation temperature of 250-400 ℃ and strain rate of 10-3 ~ 1 s-1 was studied by Gleeble-3500 thermal / dynamic testing machine. On the basis of this, the Gleeble-3500 simulation of the cumulative roll-bonding method was used to study the microstructure evolution and grain refinement mechanism during the accumulative stack welding (ARB). The results show that during the hot compression deformation of AZ91 magnesium alloy, the suitable deformation temperature is 350-400 ℃ and the strain rate is 10-3-10-2 s-1. During the process of cumulative roll-bonding of AZ91 magnesium alloy under the conditions of deformation temperature of 350 ℃, strain rate of 0.01 s-1 and deformation of 80%, the grains are obviously refined in the first rolling process, Recrystallization, in the subsequent rolling process, the degree of grain refinement is limited, but the degree of organization increases.