5052+Er铝合金的热变形行为研究
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摘要
在Gleeble-3500型热/力模拟试验机上对5052+Er合金进行了高温压缩热变形,研究了变形温度和应变速率对5052+Er合金高温压缩行为的影响。结果表明:当应变速率为0.01 s~(-1)时,真应力-真应变曲线表现出典型的动态再结晶特征;当应变速率为0.1 s~(-1)和1 s~(-1)时,曲线表现出动态回复特征;继续增加应变速率至10 s~(-1)时,流变应力达到峰值后出现后锯齿状波动,此时的合金已经发生了动态再结晶;随着变形温度的升高和应变速率的减小,5052+Er合金的流变应力会逐渐减小;5052+Er合金热压缩变形的流变应力方程为:■不同热变形条件下峰值应力的计算值与测量值的误差在10%以内。
The thermal deformation of 5052+Er alloy at high temperature was carried out with the Gleeble-3500 type thermal/force simulation test machine and the effects of deformation temperature and strain rate on the high temperature compression behavior of 5052+Er alloy were studied. The results show that when the strain rate is 0.01 s~(-1), the true stress-true strain curve presents typical dynamic recrystallization features; When the strain rates are 0.1 s~(-1) and 1 s~(-1), the curves are characterized with dynamic recovery; When the strain rate increases to 10 s~(-1), after the flow stress reaches the peak value, the zigzag wave appears, and the dynamic recrystallization of the alloy occurrs; With the increasing of the deformation temperature and the decreasing of the strain rate, the rheological stress of the 5052+Er alloy decreases gradually, and the rheological stress equation of the thermal compression deformation of 5052+Er alloy is ■, and the errors between the calculated values of the peak stress and the measured values under different thermal deformation conditions are lower than 10%.
The thermal deformation of 5052+Er alloy at high temperature was carried out with the Gleeble-3500 type thermal/force simulation test machine and the effects of deformation temperature and strain rate on the high temperature compression behavior of 5052+Er alloy were studied. The results show that when the strain rate is 0.01 s~(-1), the true stress-true strain curve presents typical dynamic recrystallization features; When the strain rates are 0.1 s~(-1) and 1 s~(-1), the curves are characterized with dynamic recovery; When the strain rate increases to 10 s~(-1), after the flow stress reaches the peak value, the zigzag wave appears, and the dynamic recrystallization of the alloy occurrs; With the increasing of the deformation temperature and the decreasing of the strain rate, the rheological stress of the 5052+Er alloy decreases gradually, and the rheological stress equation of the thermal compression deformation of 5052+Er alloy is ■, and the errors between the calculated values of the peak stress and the measured values under different thermal deformation conditions are lower than 10%.
引文
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[2] 韩颖,王国军,王英君,等.稀土元素Er对5A06铝合金铸态组织及性能的影响[J].轻合金加工技术,2018,46(2):16—21.
[3] 张静,唐聪,赵婧婧,等.均匀化退火对5052含Er铝合金显微组织的影响[J].稀有金属材料与工程,2017,46(11):3491—3497.
[4] 林双平,黄晖,文胜平,等.含Er 5083合金均匀化退火过程中Al3Er相的TEM观察[J].金属学报,2009,45(8):978—982.
[5] 王旭东,林双平,汤振雷,等.Er在Al-Mg-Mn-Zr-Er合金中的存在形式与析出特征[J].特种铸造及有色合金,2010,30(10):965—968,987.
[6] 陈贵清,傅高升,王军德,等.考虑不同应变的3003铝合金流变应力预测模型建立与验证[J].塑性工程学报,2018,25(2):265—271.
[7] 戴青松,刘栩,付平,等.5083铝合金高温变形行为及加工图[J].中南大学学报(自然科学版),2017,48(8):1988—1994.
[8] 杨群英,刘文义,张志清,等.AA7085铝合金热变形行为及加工图的研究[J].稀有金属材料与工程,2018,47(2):409—415.
[9] 薛克敏,薄冬青,李萍.轧制态7A60铝合金的热压缩显微组织及流变行为[J].材料导报,2018,32(8):1306—1310.
[10] 赵艳君,蒋长标,武鹏远,等.含稀土高镁铝合金热变形行为研究[J].中国稀土学报,2017,35(3):368—376.
[11] 戴青松,欧世声,邓运来,等.5083铝合金的热变形组织演变及晶粒度模型[J].材料导报,2017,31(14):143—146,152.
[12] 谢洪昊,陈泽中.6111铝合金热变形流变行为及本构模型[J].有色金属材料与工程,2017,38(4):198—203.
[13] 黄元春,陈鹏冲,刘宇.2219铝合金热变形行为的研究[J].热加工工艺,2016,45(6):87—90.
[14] 李红斌,李小林,徐树成,等.6082铝合金热变形流变应力曲线修正与本构方程[J].塑性工程学报,2016,23(3):152—158.
[15] CHEN G,FU G,LIN S,et al.Simulation of flow of aluminum alloy 3003 under hot compressive deformation[J].Metal Science & Heat Treatment,2013,54(11—12):623—627.
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