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为研究轧制温度对Mg-8.3Gd-2.6Y-0.4Zr(质量分数/%)合金显微组织和力学性能的影响,将500℃预轧制所得板材在200、300、400℃进行二次轧制变形。结果表明:200℃二次轧制变形使合金中引入大量位错和孪晶;合金在300℃二次轧制过程中,于晶界和晶粒内部分别形成大量的β相和β′相,而400℃二次轧制仅使合金晶界处形成粗大的β相;不同温度下二次轧制变形均使预轧制板材的基面织构强度增大,二次轧制温度越低,基面织构越强;不同温度下二次轧制变形均使预轧制板材的强度提高,二次轧制温度越低,合金强度提高越显著;经200℃二次轧制得到的合金具有331 MPa的最高屈服强度。
In order to study the effect of rolling temperature on the microstructure and mechanical properties of Mg-8.3Gd-2.6Y-0.4Zr (mass fraction /%) alloy, the pre-rolled plate at 500 ℃ was subjected to secondary treatment at 200, 300 and 400 ℃ Rolling deformation. The results show that a great deal of dislocations and twins are introduced into the alloy by secondary rolling at 200 ℃. During the secondary rolling at 300 ℃, a large amount of β phase and β ’phase are formed in the grain boundaries and grains, respectively. However, the secondary rolling at 400 ℃ only made the coarse β phase at the grain boundaries of the alloy. The secondary texturing at different temperatures both increased the textural strength of the pre-rolled sheet. The lower the secondary rolling temperature, The texture of the base surface is stronger; the deformation of the pre-rolled sheet increases with the secondary rolling deformation under different temperatures; the lower the secondary rolling temperature is, the more remarkable the strength of the alloy increases; the alloy obtained by the secondary rolling at 200 ° C has 331 MPa maximum yield strength.