(1.中国电子科技集团第三十八研究所，合肥 230088；
2.中南大学材料科学与工程学院，长沙 410000；
3.湖南省电子封装与先进功能材料重点实验室，长沙 410083)
摘 要: 针对微波组件用Al-12Si合金盖板材料中存在粗大针状Si相导致强度不足的问题，采用喷射沉积-热压制备Al-12Si和Al-12Si-1Mn-0.6Mg合金，对比分析添加1%Mn和0.6%Mg对合金微观组织、力学和热物理性能的影响。结果表明：热处理后，Al-12Si-1Mn-0.6Mg合金组织中Si相呈近球形颗粒均匀分布于Al基体，平均尺寸为(4.4±0.2) μm，基体中形成细小的Mg2Si、β″和Al6Mn析出相。相对于Al-12Si合金，Al-12Si-1Mn-0.6Mg合金在保持良好热物理性能的情况下，显微硬度、抗拉强度和伸长率分别达到(74.4±1.2) HV、(231.2±2.1) MPa和4.8%±0.1%，其中抗拉强度提高23.4%，形成细小的析出相是是抗拉强度提高的主要原因。
关键字: Al-12Si合金；喷射沉积；热物理性能；力学性能；强化机制
（1.China Electronics Technology Group Corporation No.38 Research Institute, Heifei 230088, China;
2.School of Materials Science and Engineering, Central South University, Changsha 41000, China;
3. Key Laboratory of Electronic Packaging and Advanced Functional Materials, Hunan Province, Changsha 410083, China）
Abstract:To solve the problem of thick needle-like Si phase and insufficient strength of Al-12Si alloy for shell material, Al-12Si and Al-12Si-1Mn-0.6Mg alloys were prepared by spray deposition and hot pressing, and the effects of addition of 1% Mn and 0.6% Mg(mass fraction) on microstructure, mechanical and thermo-physical properties of Al-12Si-1Mn-0.6Mg alloy were investigated and compared. The results show that Si phase exhibits spherical shape with an average size of (4.4±0.2) μm, which distributes homogeneously in the Al matrix in the spray deposited Al-12Si-1Mn-0.6Mg alloy. At the same time, the fine Mg2Si, β″and Al6Mn precipitates form in the matrix after heat treatment. Compared with Al-12Si alloy, Al-12Si-1Mn-0.6Mg alloy maintains good thermo-physical properties, and its microhardness, tensile strength, and elongation reach are (74.4±1.2)HV, (231.2±2.1) MPa and 4.8%±0.1%, respectively, the tensile strength increases by 23.4%. The enhanced strength is mainly attributed to the precipitation strengthening.
Key words: Al-12Si alloy; spray deposition; thermo-physical property; mechanical property; strengthening mechanism
