(華南理工大學(xué) 國(guó)家金屬材料近凈成形工程技術(shù)研究中心，廣州 510640)
摘 要: 采用差示掃描量熱法(DSC)對(duì)SiCp/6061復(fù)合材料和6061合金時(shí)效析出動(dòng)力學(xué)進(jìn)行研究，并結(jié)合Avrami-Johnson-Mehl方法分析SiCp的加入對(duì)6061鋁合金時(shí)效析出動(dòng)力學(xué)的影響，計(jì)算出連續(xù)升溫過(guò)程中各亞穩(wěn)相的析出動(dòng)力學(xué)參數(shù)。結(jié)果表明：SiCp抑制6061鋁合金GP區(qū)的形成，促進(jìn)β″相、β′相和Q′相、β相和Q相的析出。計(jì)算各相析出動(dòng)力學(xué)表達(dá)式及TTT曲線，利用硬度測(cè)試實(shí)驗(yàn)對(duì)計(jì)算結(jié)果進(jìn)行對(duì)比驗(yàn)證。
關(guān)鍵字: SiCp/6061；析出動(dòng)力學(xué)；差熱分析法；TTT曲線
（National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640）
Abstract:The kinetics of precipitation during aging of SiCp/6061 composites and 6061 alloys were investigated by differential scanning calorimetric analyses (DSC). The influence of SiCp on the precipitation kinetics of 6061 matrix was analyzed. The kinetic parameters of metastable phases in the composites and alloys were obtained by using Avrami-Johnson-Mehl (AJM) equation. The results show that GP zone formation is significantly suppressed with the addition of SiCp, while the precipitation of β″, β′ and Q′, β and Q phases are enhanced. In addition, TTT curves and kinetic expresses of metastable phases for the composites and alloys were calculated. The calculation results are compared and validated with hardness measurement, showing good agreement between the calculation and experiment results.
Key words: SiCp/6061 composite; precipitation kinetics; differentia scanning calorimetry; TTT curve
