X2A66铝锂合金等温压缩时的流变变形行为

发布时间：2018-04-21 17:31

本文选题：XA合金 + 等温压缩　；参考：《稀有金属材料与工程》2017年01期

【摘要】：采用Gleeble-3500热模拟试验机对X2A66合金进行等温热压缩实验,变形温度为623.15~743.15 K、应变速率为0.001~10 s~(-1),并利用双曲正弦函数和动态材料模型,建立合金峰值应力的本构方程和加工图。结果表明:X2A66合金的流变应力随温度的升高而减小,随应变速率的增加而增大;X2A66合金的温度敏感性不受应变速率的影响,高应变速率(应变速率高于0.1 s~(-1))时的速率敏感性高于低应变速率时的速率敏感性。X2A66合金等温压缩时峰值流变应力和应变速率之间满足双曲正弦函数关系,其本构方程为:e(5)=5.09×10~9[sinh(0.019σ)]~(4.54414)exp( 145.377/RT)。在实验工艺参数范围内,X2A66合金的失稳区集中在高应变速率区,当应变速率为0.01~0.3 s~(-1),温度为700~743 K时是耗散效率的峰值区域,也是X2A66合金最佳的热加工工艺区。
[Abstract]:The isothermal compression test of X2A66 alloy was carried out by using Gleeble-3500 thermal simulation machine. The deformation temperature was 623.15 ~ 743. 15 K and the strain rate was 0.001 ~ 10 s-1 ~ (-1). The constitutive equation and processing diagram of peak stress of X2A66 alloy were established by using hyperbolic sinusoidal function and dynamic material model. The results show that the flow stress decreases with the increase of temperature, and the temperature sensitivity of X2A66 alloy increases with the increase of strain rate. The rate sensitivity at high strain rate (strain rate higher than 0.1 s-1) is higher than that at low strain rate. The relationship between the peak rheological stress and strain rate of X2A66 alloy during isothermal compression satisfies the hyperbolic sinusoidal function. The constitutive equation of the strain rate is as follows: 1. The strain rate is 5.09 脳 10 ~ (9) [sinh(0.019 蟽]. The instability region of X2A66 alloy is concentrated in the high strain rate region in the range of experimental technological parameters. When the strain rate is 0.01 ~ 0. 3 s-1 ~ (-1) and the temperature is 700 ~ 743 K, it is the peak region of dissipation efficiency and the best hot working process area for X2A66 alloy.
【作者单位】：北京工业大学;北京航空材料研究院;
【基金】：国家自然科学基金(E041501)
【分类号】：TG146.21

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