| 冀宏亮,边丽萍,郑毅,刘先文,梁伟.道次压下量对2197铝锂合金轧制组织与力学性能的影响[J].稀有金属材料与工程,2023,52(4):1476~1482.[Hongliang Ji,Liping Bian,Yi Zheng,Xianwen Liu,Wei Liang.Effect of rolling reduction per pass on microstructure and mechanical properties of 2197 Al-Li alloy[J].Rare Metal Materials and Engineering,2023,52(4):1476~1482.] |
| 道次压下量对2197铝锂合金轧制组织与力学性能的影响 |
| 投稿时间：2022-03-05 修订日期：2022-05-07 |
| 中文关键词: 铝锂合金，轧制 晶粒细化，析出相，力学性能 |
| 基金项目:国家自然科学基金面上项目(52175355)；国家重点研发计划项目课题任务(2018YFA0707304)；山西省重点研发计划项目(201903D121087) |
| 中文摘要: |
| 针对铝锂合金塑韧性、成形性差的问题,本文通过OM/SEM微观组织分析、拉伸及硬度/电导率测试,研究了在总压下量75%条件下、轧制道次压下量对2197铝锂合金组织与力学性能的影响。结果表明：道次压下量显著影响铝锂合金的晶粒结构、析出相的数量及分布。轧制态合金的强度随单道次轧制压下量的增加而显著增加、而塑韧性则明显下降。T8时效处理使析出相大量析出,轧制合金中的PLC效应得到消除,小、大道次压下量轧制合金的力学性能得到显著提升。大压下量轧制合金经时效处理后强塑性综合力学性能最高,抗拉强度为384.94MPa、断后伸长率为12.45%,较小、中道次压下量轧制时效合金分别提高2%、21%和29%、31%。 |
| Effect of rolling reduction per pass on microstructure and mechanical properties of 2197 Al-Li alloy |
| 英文关键词:Al-Li alloys, rolling grain refinement, precipitates, mechanical properties. |
| 英文摘要: |
| Aiming at the poor ductility, toughness and formability of Al-li alloy, the effect of per-pass reduction on microstructure and mechanical properties of 2197 Al-Li alloy were studied by OM/SEM microstructure analysis, tensile properties and hardness/conductivity test, with a constant total reduction of 75%. The result show that the grain structure, the amount and distribution of precipitates are significantly affected by per-pass reduction. The strength of as-rolled alloy increases significantly with the increase of per-pass reduction, while the ductility and toughness decrease obviously. After T8 aging treatment, a large amount of precipitates are produced and the PLC (Portevin-Le Chatelier phenomenon) effect in the rolled alloy is eliminated. The mechanical properties of the alloy rolled by light and heavy reduction are improved significantly. After aging treatment, alloy exhibits the optimal comprehensive mechanical properties with tensile strength of 384.94MPa and the elongation to fracture of 12.45%, which are 2%, 21% and 29%, 31% higher than those of the light and middle reduction alloys, respectively. |
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