(1.中國電子科技集團第三十八研究所，合肥 230088；
2.中南大學(xué)材料科學(xué)與工程學(xué)院，長沙 410000；
3.湖南省電子封裝與先進功能材料重點實驗室，長沙 410083)
摘 要: 針對微波組件用Al-12Si合金蓋板材料中存在粗大針狀Si相導(dǎo)致強度不足的問題，采用噴射沉積-熱壓制備Al-12Si和Al-12Si-1Mn-0.6Mg合金，對比分析添加1%Mn和0.6%Mg對合金微觀組織、力學(xué)和熱物理性能的影響。結(jié)果表明：熱處理后，Al-12Si-1Mn-0.6Mg合金組織中Si相呈近球形顆粒均勻分布于Al基體，平均尺寸為(4.4±0.2) μm，基體中形成細小的Mg2Si、β″和Al6Mn析出相。相對于Al-12Si合金，Al-12Si-1Mn-0.6Mg合金在保持良好熱物理性能的情況下，顯微硬度、抗拉強度和伸長率分別達到(74.4±1.2) HV、(231.2±2.1) MPa和4.8%±0.1%，其中抗拉強度提高23.4%，形成細小的析出相是是抗拉強度提高的主要原因。
關(guān)鍵字: Al-12Si合金；噴射沉積；熱物理性能；力學(xué)性能；強化機制
（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
