热速处理对Al-7Si-Mg合金组织与性能影响  

Effect of Thermal Rate Treatment on Microstructure and Mechanical Properties of Al-7Si-Mg Alloy

作　　者：蒋朝军 张文达[2] 杨晶[2] 刘云[2] 

机构地区：[1]重庆国际复合材料有限公司,重庆400082 [2]中北大学材料科学与工程学院,山西太原030051

出　　处：《热加工工艺》2013年第4期219-222,共4页Hot Working Technology

摘　　要：研究了热速处理工艺参数(过热温度、冷却速度)对Al-7Si-Mg合金组织和力学性能影响。结果表明:在相同的熔体冷却速度下,过热温度越高,材料成分、组织越均匀;在过热温度950℃下,随熔体冷却速度的增加,α-Al趋于等轴状,共晶Si的形态也变得细小。在25℃/s的熔体冷却速度下,材料抗拉强度和伸长率分别比常规熔体处理的试样分别提高了13%和104%;因此,通过对熔体热速处理,提高过热温度和熔体冷却速度,可以显著提高合金的综合力学性能。The influences of thermal rate treatment parameters （overheating temperature, cooling rate） on the microstructure and mechanical properties of A1-7Si-Mg alloy were investigated. The results show that： under the same cooling rate of melt, the melt overheating temperature is higher, the composition and microstructure is more uniform; at 950 ℃, with the increase of melt cooling rate, a-Al is becoming equiaxed shape, the morphology of eutectic Si becomes small. With 25 ℃/s of melt cooling rate, the ultimate tensile strength and elongation of A1-7Si-Mg alloy is more higher than normal melt treatment by 13% and 104%, respectively. Therefore, the melt thermal rate treatment with higher overheating temperature and higher melt cooling rate, can significantly improve the mechanical properties of the alloy.

关 键 词：Al-7Si-Mg合金 热速处理 质量指标 

分 类 号：TG156.9[金属学及工艺—热处理]