论文部分内容阅读
采用Gleeble-3800热/力模拟试验机研究了应变速率为0.01~10s~(-1),变形温度为300~450℃的ZE42镁合金高温压缩变形时的流变特征,同时根据材料动态模型(DMM)建立了ZE42镁合金在应变量分别为0.35,0.40和0.45条件下的热加工图。结果表明,ZE42镁合金在试验温度范围内热压缩变形的平均表观激活能为151kJ/mol。应变量对该合金的热加工图有明显影响。当应变量为0.40时,仅在300℃,10s~(-1)附近或者是320℃,0.01s~(-1)附近的2个极小区域内处于失稳状态,然而当应变量为0.35和0.45时失稳区主要分布在温度>320℃,应变速率在0.1~1.0s~(-1)的较大区间内。350~450℃,应变速率≤0.1s~(-1)为ZE42镁合金适宜的热加工区间,该区间功率耗散因子峰值η_(max)=83%,压缩变形主要为连续动态再结晶晶界滑动协调流变机制。
The rheological characteristics of ZE42 magnesium alloy under high temperature compression deformation with strain rate of 0.01 ~ 10s -1 and deformation temperature of 300 ~ 450 ℃ were studied by Gleeble-3800 thermal / mechanical simulation test machine. According to the dynamic model of material DMM) established ZE42 magnesium alloy strain at 0.35, 0.40 and 0.45 thermal processing under the conditions of the figure. The results show that the average apparent activation energy of ZE42 magnesium alloy during hot compression deformation is 151 kJ / mol. The amount of strain has a significant effect on the hot work pattern of the alloy. When the strain is 0.40, it is in a state of instability only in two extremely small areas near 300 ℃, 10s ~ (-1) or 320 ℃, 0.01s ~ (-1). However, when the strain is 0.35 And 0.45, the instability zone mainly distributes in the temperature> 320 ℃ and the strain rate is in the larger range of 0.1 ~ 1.0s ~ (-1). 350 ~ 450 ℃, the strain rate ≤0.1s ~ (-1) is the suitable thermal processing zone of ZE42 magnesium alloy, the peak value of power dissipation factor η_ (max) is 83%, and the compressive deformation is mainly continuous dynamic recrystallization grain boundary Sliding coordination rheology mechanism.