Particles Morphology and Forming Analysis of Al-Si-Cu-Mg Alloys

摘要

The study aims at observation of precipitation distribution micrograph and analysis of forming kinetics mechanism of microstructure particles of Al-Si-Cu-Mg alloys. The microstructure morphology of some particles such as primary silicon and precipitates from the matrix of Al-Si-Cu-Mg alloys is observed by OM,SEM and EDS. The primary silicon forming kinetics is analyzed by EBSD. Twin plane re-entrant edge growth mode results in the blocky or diamonded TRD morphology formation. The precipitates of Q-Al5Cu2Mg8Si6,θ-Al2Cu,β-Al5FeSi and ε-Mg2Si are characterized by EDS and they are distributed in the eutectic region. The forming kinetics of them is analyzed by DSC. Six peaks are present in particles formation in different temperature ranges.The particles forming are determined by the analysis of the DSC traces during heating and cooling of Al-Si-CuMg alloys.