Microstructure and Properties of Magnesium Alloy for Titanium-containing Mechanical Shell Forged at High Strain Rate
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摘要: 进行了不同钛含量AZ80Ti含钛机械壳体镁合金试样的高应变速率锻造试验，并进行了显微组织和力学性能测试比较和分析。结果表明：钛含量、锻造温度和应变速率均对试样显微组织和力学性能产生重要影响。随钛含量从0.4%增大到1.2%、应变速率从50 s-1增大到125 s-1时，试样平均晶粒尺寸先减小后基本不变，力学性能先提高后基本不变；随锻造温度从300℃增加至340℃，试样平均晶粒尺寸先减小后增大，力学性能先提高后下降。钛含量0.8%时试样的抗拉强度和屈强强度较钛含量0.4%时分别增加31 MPa、29 MPa；320℃锻造时试样的抗拉强度和屈强强度较300℃锻造时分别增加了38 MPa、39 MPa；应变速率100 s-1时试样的抗拉强度和屈强强度较应变速率50 s-1时分别增大19 MPa、21 MPa。Abstract: High strain rate forging tests for AZ80 Ti titanium-containing mechanical shell magnesium alloy specimens were carried out,and the microstructure and mechanical properties were compared and analyzed.The results show that the content of titanium,forging temperature and strain rate have important effects on the microstructures and mechanical properties of the specimens.With the increase of titanium content from 0.4% to 1.2% and strain rate from 50 s-1 to 125 s-1,the average grain size of the sample decreases first and then remains basically unchanged,while the mechanical properties of the sample increase first and then remain basically unchanged.With the forging temperature increasing from 300 ℃ to 340 ℃,the average grain size of the sample decreases first and then increases,and the mechanical properties increase first and then decrease.Compared with the sample with 0.4% titanium content,the tensile strength and yield strength of the specimens with 0.8% titanium increase by 31 MPa and 29 MPa,respectively.Compared with the sample with forging temperature of 300 ℃,the tensile strength and yield strength of the specimens forged at 320 ℃ increase by 38 MPa and 39 MPa,respectively.Compared with the sample with strain rate of 50 s-1,the tensile strength and yield strength of the specimens respectively increase by 19 MPa and 21 MPa at 100 s-1 of strain rate.
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