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热循环对β-LiAlSiO_4/Cu复合材料热膨胀行为的影响(英文)

Effects of thermal cycling on thermal expansion behaviors of β-LiAlSiO_4 reinforced copper matrix composites
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摘要 采用热压烧结工艺制备β-LiAlSiO4/Cu复合材料。对复合材料进行多次热循环过程中的热膨胀行为测试,对烧结态复合材料进行原位高温XRD分析,对热循环前后复合材料的微观组织进行观察。结果表明:经过2次以上热循环处理后,β-LiAlSiO4/Cu复合材料获得稳定的热膨胀系数。在热循环过程中复合材料残余应力得到松弛和释放,可以显著降低复合材料的热膨胀系数。复合材料中的残余应力引起β-LiAlSiO4颗粒中的Li+从有序到无序的非可逆性的相转变。在热循环过程中复合材料残余应力的释放引起基体孪晶变形。 采用热压烧结工艺制备β-LiAlSiO4/Cu复合材料。对复合材料进行多次热循环过程中的热膨胀行为测试,对烧结态复合材料进行原位高温XRD分析,对热循环前后复合材料的微观组织进行观察。结果表明:经过2次以上热循环处理后,β-LiAlSiO4/Cu复合材料获得稳定的热膨胀系数。在热循环过程中复合材料残余应力得到松弛和释放,可以显著降低复合材料的热膨胀系数。复合材料中的残余应力引起β-LiAlSiO4颗粒中的Li+从有序到无序的非可逆性的相转变。在热循环过程中复合材料残余应力的释放引起基体孪晶变形。
出处 《中国有色金属学会会刊:英文版》 CSCD 2011年第S2期384-388,共5页 Transactions of Nonferrous Metals Society of China
基金 Projects(50671029,50801016)supported by National Natural Science Foundation of China Project(2011CB612200)supported by the National Basic Research Program of China
关键词 铜基复合材料 热膨胀 残余应力 相转变 copper matrix composite thermal expansion residual stress phase transition
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