6061和SiCp/6061合金時效析出動力學

6061和SiCp/6061合金時效析出動力學Kinetics of precipitation during aging of 6061 and SiCp/6061 alloys

采用差示掃描量熱法(DSC)對SiCp/6061復合材料和6061合金時效析出動力學進行研究，并結合Avrami-Johnson-Mehl方法分析SiCp的加入對6061鋁合金時效析出動力學的影響，計算出連續(xù)升溫過程中各亞穩(wěn)相的析出動力學參數(shù)。結果表明：SiCp抑制6061鋁合金GP區(qū)的形成，促進β″相、β′相和Q′相、β相和Q相的析出。計算各相析出動力學表達式及TTT曲線，利用硬度測試實驗對計算結果進行對比驗證。

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.

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