汽车用ZL101铝合金复合稀土变质与热处理工艺研究

李林峻

doi:10.14158/j.cnki.1001-3814.20211482

汽车用ZL101铝合金复合稀土变质与热处理工艺研究

李林峻

Study on Composite RE Modification and Heat Treatment Process of ZL101 Aluminum Alloy for Automobile

LI Linjun

摘要

摘要: 采用显微组织观察、拉伸试验研究了ZL101铝合金的Ce-La复合稀土（Ce含量65%，La含量35%）变质与热处理工艺。结果表明：添加0.05%复合稀土对ZL101铝合金进行变质处理，可以有效减小合金中α-Al二次枝晶间距，细化共晶Si组织；与未变质的ZL101铝合金相比，变质处理的ZL101铝合金的抗拉强度、屈服强度和伸长率分别提高了6.5%、4.5%和47.1%。对其进行540℃×4 h固溶+170℃×8 h时效处理后，ZL101铝合金组织中共晶Si相呈颗粒状，均匀分布在晶界处，其抗拉强度、屈服强度和伸长率分别达到306 MPa、231 MPa和6.3%，综合力学性能匹配最好。

Abstract: The modification of ZL101 aluminum alloy with Ce-La composite rare earth(65%Ce and 35%La) and its heat treatment process were studied by means of microstructure observation and tensile test.The results show that the modification of ZL101 aluminum alloy with the addition of 0.05% composite RE can effectively reduce the secondary dendrite spacing of α-Al and refine the eutectic Si structure.Compared with those of the unmodified ZL101 aluminum alloy, the tensile strength, yield strength and elongation of the modified ZL101 aluminum alloy are increased by 6.5%, 4.5% and 47.1% respectively.After solution treatment at 540℃×4 h and aging treatment at 170℃×8 h, the eutectic Si phase of ZL101 aluminum alloy is granular and uniformly distributed at grain boundaries.The tensile strength, yield strength and elongation reach 306 MPa, 231 MPa and 6.3% respectively.The comprehensive mechanical property match of ZL101 aluminum alloy is the best.

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