CAJ | 학술논문

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,-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-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.
채용열압소결공예제비β-LiAlSiO4/Cu복합재료.대복합재료진행다차열순배과정중적열팽창행위측시,대소결태복합재료진행원위고온XRD분석,대열순배전후복합재료적미관조직진행관찰.결과표명:경과2차이상열순배처리후,-LiAlSiO4/Cu복합재료획득은정적열팽창계수.재열순배과정중복합재료잔여응력득도송이화석방,가이현저강저복합재료적열팽창계수.복합재료중적잔여응력인기-LiAlSiO4과립중적Li+종유서도무서적비가역성적상전변.재열순배과정중복합재료잔여응력적석방인기기체련정변형.
β-LiAlSiO4 reinforced Cu matrix composites (Euc/Cu) were fabricated by hot-pressed sintering process.Thermal expansion behaviors of Euc/Cu composites were studied during the thermal cycling process.Upon twice thermal cycle,the temperature dependence of the coefficients of thermal expansion (CTE) for Euc/Cu composites tends to be stable.The CTEs of the composite can be obviously decreased by the releasing of the thermal mismatch stress (TMS) in thermal cycling process.The TMS induces the irreversible phase transition of Li+ order-disorder of Euc particles in the composite.Meanwhile,the relaxation of TMS during thermal cycling causes the twins deformation of matrix in the Euc/Cu composites.