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运用金相显微镜、扫描电镜、能谱仪、X射线衍射仪和万能电子拉伸试验机等研究了稀土Ce对A356铝合金显微组织和力学性能的影响。结果表明,稀土Ce是A356铝合金的一种优良变质剂,不但能使α-Al初生相晶粒得到细化,而且能使共晶硅变得细小、圆整且分布均匀。稀土Ce在A356铝合金中主要以稀土金属间化合物Al_(11)Ce_3相存在。当Ce添加量为0.04%时,A356铝合金的抗拉强度、屈服强度及延伸率分别为307.5 MPa、239 MPa、7.72%,比未添加Ce的A356铝合金分别提高了7.89%、24.48%和108.09%。
The effects of rare earth Ce on the microstructure and mechanical properties of A356 aluminum alloy were studied by means of metallographic microscope, scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction and universal electronic tensile tester. The results show that rare earth Ce is an excellent modifier of A356 aluminum alloy, which can not only refine the α-Al primary phase grains, but also make the eutectic silicon fine, round and evenly distributed. The rare earth Ce is mainly present in the A356 aluminum alloy as the rare earth intermetallic compound Al 11 Ce 3 phase. When the addition amount of Ce is 0.04%, the tensile strength, yield strength and elongation of A356 aluminum alloy are 307.5 MPa, 239 MPa and 7.72% respectively, which are 7.89% and 24.48% higher than that of A356 aluminum alloy without Ce 108.09%.