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采用粉末冶金法制备Sip/Al基复合材料,利用光学显微镜及万能拉伸试验机对Sip/Al复合材料中Si相形貌演变规律和力学性能进行了研究,用奥斯特瓦尔德熟化机制解释了Si颗粒长大机理。研究表明:随着烧结温度的提高,Sip/Al复合材料中Si元素先脱溶析出形成细小的Si颗粒后聚集长大。Sip/Al基复合材料热挤压后,基体中分布着弥散的Si颗粒,固溶处理后,Si颗粒形态发生钝化变得圆整,而固溶处理4 h后,Si颗粒聚集长大并出现搭接现象。Sip/Al基复合材料抗拉强度随着固溶时间的延长先增加后降低,在固溶处理2 h时达到最大值228.1 MPa。
The Sip / Al matrix composites were prepared by powder metallurgy method. The morphology and mechanical properties of Si phase in Sip / Al composites were studied by optical microscope and universal tensile tester. The results of Ostwald ripening mechanism The growth mechanism of Si particles. The results show that with the increase of sintering temperature, the Si elements in Sip / Al composites first precipitate and form fine Si particles and then aggregate and grow. After Sip / Al matrix composites were hot extruded, the dispersed Si particles were distributed in the matrix. After the solution treatment, the morphology of Si particles became round and rounded. After 4h of solution treatment, the Si particles aggregated and grew Appear lap phenomenon. The tensile strength of Sip / Al composites increases first and then decreases with the increase of solution time, reaching the maximum value of 228.1 MPa at 2 h after solution treatment.