周璇,肖华强,田雨鑫,等.2195铝锂合金热变形流变行为与热加工图研究[J].精密成形工程,2023,15(1):8-16.
ZHOU Xuan,XIAO Hua-qiang,TIAN Yu-xin,et al.Hot Deformation Behavior and Hot Processing Map of 2195 Al-Li Alloy[J].Journal of Netshape Forming Engineering,2023,15(1):8-16. |
| 2195铝锂合金热变形流变行为与热加工图研究 |
| Hot Deformation Behavior and Hot Processing Map of 2195 Al-Li Alloy |
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| DOI：10.3969/j.issn.1674-6457.2023.01.002 |
| 中文关键词: 2195铝锂合金 热变形试验 流变应力 本构模型 热加工图 |
| 英文关键词: 2195 Al-Li alloy hot deformation test flow stress constitutive model hot processing map |
| 基金项目:国家自然科学基金(52065009);贵州省科技计划(ZK2022204);贵阳市科技计划(筑科合同[2021]1?4号);国家重点研发计划“科技助力经济2020”重点专项(SQ2020YFF0421630) |
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| 中文摘要: |
| 目的 研究2195铝锂合金在实验温度360~510 ℃、应变速率0.01~10 s−1条件下的热压缩变形行为，建立其本构模型及热加工图，获取该合金的安全加工工艺参数。方法 采用Gleeble−3500热模拟试验机进行热变形实验，分析合金的流变行为及热加工图，结合微观组织阐述其热变形机理，并对所得最优参数进行热挤压实验验证。结果 2195铝锂合金的流变应力随变形温度增加而减小，随应变速率增加而增加;其热激活能Q为203.643 9 kJ/mol、结构因子A为1.943 9×1014、应力因子α为0.013、应变硬化指数n为5.883 9。确定合金的主要失稳区工艺参数区间为379~420 ℃、0.75~10 s–1和480~510 ℃、1～10 s−1，安全加工区间为440~510 ℃、0.01~0.25 s−1。铸态2195铝锂合金的屈服和抗拉强度分别仅为(179±6)MPa和(239±11)MPa，经热挤压实验后分别达到(605±6)、(633±3)MPa，分别提高了3.5和2.6倍;铸态合金的显微硬度仅为(115±1)HV，热加工后型材达到(178±4)HV，相较于铸态合金增加了54%。结论 2195铝锂合金的流变行为符合正应变速率敏感特征，其安全加工区域集中在高温低应变速率区，主要发生了动态再结晶，实验型材在此区域表现出卓越的力学性能。 |
| 英文摘要: |
| The work aims to investigate the hot compression deformation behavior of 2195 Al-Li alloy at the experimental temperature of 360-510 ℃ and the strain rate of 0.01-10 s−1 and establish its constitutive model and processing map to obtain the safe processing parameters. The hot deformation experiment was carried out by Gleeble-3500 thermal simulation tester. The deformation behavior and processing map of the alloy were analyzed. The hot deformation mechanism was expounded in combination with the microstructure, and the obtained optimal parameters were verified by hot extrusion experiment. The flow stress of 2195 Al-Li alloy decreased with the increase of deformation temperature and increased with the increase of strain rate. It was determined that thermal activation energy Q=203.643 9 kJ/mol, structure factor A=1.943 9×1014, stress factor α=0.013 0 and strain hardening exponent n=5.883 9. The range of process parameters for the main unstable region of the alloy was 379-420 ℃, 0.75-10 s−1 and 480-510 ℃, 1-10 s−1 and the safe processing region of the alloy was determined to be 440-510 ℃, 0.01-0.25 s−1. The yield strength and tensile strength of the as-cast 2195 Al-Li alloy were only (179±6) MPa and (239±11) MPa, while these two values after hot extrusion experiment reached (605±6) MPa and (633±3) MPa, increasing by 3.5 and 2.6 times, respectively. The microhardness of the as-cast alloy was only (115±1)HV, while the microhardness of profile after hot processing reached (178±4) HV, which was 54% higher than that of the as-cast alloy. The deformation behavior of 2195 Al-Li alloy is consistent with positive strain rate sensitivity. The safe processing region of the alloy is concentrated in the high-temperature low-strain rate region, where dynamic recrystallization mainly occurs and the experimental profile shows excellent mechanical properties. |
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