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利用金相观察、SEM和XRD等方法研究了生坯挤压并在N2气氛下烧结制备的Al-Si-Cu合金的微观组织,并测试了其力学性能。结果表明,Al-Si-Cu合金生坯经过挤压后,致密度增加,Si和Cu的晶粒均匀分布在Al基体中,无明显界面。其物相组成为α-Al、β-Si、Al2O3、CuAl2和Cu4Si,其中CuAl2和Cu4Si是在挤压后烧结过程中形成。合金力学性能显著提高,其硬度(HV)、抗拉强度和伸长率分别为71.5、400 MPa和13.8%,断口形貌从典型的冰糖状脆性断口转变为含有韧窝的塑性断口。
The microstructure of Al-Si-Cu alloy prepared by green compaction and sintering in N2 atmosphere was studied by means of metallographic observation, SEM and XRD. The mechanical properties of Al-Si-Cu alloy were tested. The results show that the density of Al-Si-Cu alloy green sheets increases after extrusion, and the Si and Cu grains are uniformly distributed in the Al matrix with no obvious interface. The phase composition is α-Al, β-Si, Al 2 O 3, CuAl 2 and Cu 4 Si, CuAl 2 and Cu 4 Si are formed during the post extrusion sintering. The mechanical properties of the alloy were significantly improved. The hardness (HV), tensile strength and elongation of the alloy were 71.5, 400 MPa and 13.8%, respectively. The fracture morphology changed from the typical rock candy-like brittle fracture to the plastic fracture with dimple.