Ce变质与退火对汽车用ADC12铝合金组织与性能的影响  

Effect of Ce modification and annealing on microstructure and properties of ADC12 aluminum alloy for automobile

作　　者：安仕琪 郝增田 An Shiqi;Hao Zengtian(Luohe Institute of Technology,Henan University of Technology,Luohe Henan 462000,China;Institute of Materials,Henan Academy Sciences,Zhengzhou Henan 452100,China)

机构地区：[1]河南工业大学漯河工学院,河南漯河462000 [2]河南省科学院材料研究所,河南郑州452100

出　　处：《金属热处理》2024年第12期179-183,共5页Heat Treatment of Metals

基　　金：河南省科技攻关项目(212102310959)。

摘　　要：采用OM、硬度测试、电导率测试等手段研究了不同添加量Ce变质对铸态ADC12铝合金微观组织和硬度的影响,以及不同温度退火后其组织、硬度和电导率变化。结果表明,在0%~0.6%Ce的范围内,随着Ce添加量的增加,ADC12铝合金的α-Al相和共晶Si相尺寸不断减小,硬度不断提高至67.8 HBS,变质效果变好,当Ce添加量继续增加到0.8%时,ADC12铝合金的变质效果变差,ADC12铝合金的Ce最佳添加量为0.6%。对0.6%Ce变质ADC12铝合金进行450、480、510和540℃退火处理,可以细化铸态ADC12铝合金中的共晶Si相,提升合金的硬度和电导率;当退火温度为510℃时,ADC12铝合金的硬度和电导率均达到最佳,分别为84.5 HBS和22.61 MS/m。Effects of modification with different amounts of Ce on microstructure and hardness of the as-cast ADC12 aluminum alloy were studied by using OM,hardness testing,conductivity testing and other methods,as well as the changes in microstructure,hardness,and conductivity after annealing at different temperatures.The results show that within the range of 0%to 0.6%Ce,with the increase of Ce addition,the size of theα-Al phase and that of eutectic Si phase in the tested ADC12 aluminum alloy continuously decrease,and the hardness increases to 67.8 HBS,indicating a better modification effect.When the Ce addition continues to increase to 0.8%,the modification effect for the tested ADC12 aluminum alloy deteriorates,and the optimal Ce addition amount is 0.6%.Annealing treatment of the 0.6%Ce modified ADC12 aluminum alloy at 450,480,510,and 540℃can refine the eutectic Si phase in the as-cast ADC12 aluminum alloy,enhance the hardness and conductivity of the alloy.When the annealing temperature is 510℃,the hardness and conductivity of the ADC12 aluminum alloy reach their optimal values of 84.5 HBS and 22.61 MS/m,respectively.

关 键 词：ADC12铝合金 Ce变质 退火 微观组织 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]