锻压技术

固溶和双级时效对反挤压2A12铝合金组织和性能的影响

英文标题：Influence of solid solution and two\|stage aging on microstructure and  properties for backward extrustion 2A12 aluminum alloy

作者：闫凡徐健闫林卢知渊

单位：中北大学

关键词：反挤压 2A12铝合金微观组织固溶温度双级时效力学性能

分类号：TG166.3;TG146.21

出版年,卷(期):页码：2020,45(1):179-185

摘要：

采用光学显微镜（OM）、扫描电子显微镜（SEM）、能谱分析、X射线衍射（XRD）和常温万能拉伸试验机等观察检测手段，针对由反挤压工艺制备的2A12铝合金经过不同的固溶加双级时效（T6）处理，观察并分析在不同条件下处理前、后试样的微观组织和力学性能之间的联系。结果表明：在不同的固溶温度下，得到505 ℃×1 h的晶粒尺寸细小且弥散相沿晶界序列排布，残留共晶相溶解较充分，力学性能佳。继而分别研究双级时效温度和时间对合金组织和性能的影响，得到在100 ℃×2 h+200 ℃×5 h时合金的抗拉强度最高，达到450.5 MPa，伸长率为14%，晶体中析出大量强化相θ（Al2Cu）和纳米级S相（Al2CuMg），并且弥散分布着难以随温度和时间溶解的T相（Al20Cu2Mn3）。

For 2A12 aluminum alloy prepared by the backward extrusion process in different solid solution plus two\|stage aging (T6) treatment, the relationship between microstructure and mechanical properties of samples before and after treatment under different conditions was observed and analyzed by optical microscopy (OM), scanning electron microscopy (SEM), energy spectrum analysis, X\|ray diffraction (XRD) and universal tensile testing machines at normal temperature. The results show that at different solid solution temperatures, the grain size of 505 ℃×1 h is fine, the dispersed phase is arranged along the grain boundary sequence, the residual eutectic phase is well dissolved, and the mechanical properties are good. Then, the influences of two\|stage aging temperature and time on the microstructure and properties of the alloy were studied. The tensile strength of 450.5 MPa is the highest at 100 ℃×2 h+200 ℃×5 h with the elongation of 14%. Furthermore, a large number of strengthening phase θ[DK](Al2Cu) and nano-S phase (Al2CuMg) are precipitated in the crystal, and the T phase (Al20Cu2Mn3) which is difficult to dissolve with temperature and time is dispersedly distributed.

基金项目：

山西省自然科学基金资助项目（201801D121106）

作者简介：闫凡（1993-），女，硕士研究生 E-mail：1226026333@qq.com 通讯作者：徐健（1987-），男，博士，讲师 E-mail：812210984@qq.com

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