Investigation of the Quench Sensitivity of an AlSi10Mg Alloy in Permanent Mold and High-Pressure Vacuum Die Castings

Materials

Francis Breton¹  Mengyun Liu²  Zhan Zhang²  X.-Grant Chen² 

[1] Arvida Research and Development Centre, Rio Tinto Aluminum, Saguenay, QC G7S 4K8, Canada;Department of applied sciences, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada;

关键词: AlSi10Mg alloy;    quench sensitivity;    permanent mold casting;    high pressure vacuum die casting;    heat treatment;    microstructure;   

DOI  :  10.3390/ma12111876

来源: DOAJ

【 摘 要 】

The quench sensitivities of an AlSi10Mg alloy in permanent mold (PM) and high-pressure vacuum die (HPVD) castings were investigated with time−temperature−transformation and time−temperature−property diagrams using an interrupted quench technique. The quench-sensitive temperature range of the HPVD casting sample is 275−450 °C, and its nose temperature is 375 °C. The quench-sensitive range of the PM casting sample is 255−430 °C, and the nose temperature is 350 °C. The mechanical strength versus the cooling rate in both casting samples were predicted via a quench factor analysis and verified experimentally. The critical cooling rate of the HPVD casting sample is 20 °C/s whereas it is 17 °C/s for the PM casting sample. With a shorter critical time, higher nose temperature, and higher critical cooling rate, the HPVD casting sample exhibits a higher quench sensitivity than the PM casting sample. The differences in the quench sensitivities of the AlSi10Mg alloy due to the different casting processes is explained via the different precipitation behavior. At the nose temperature, coarse β-Mg₂Si precipitates mainly precipitate along the grain boundaries in the HPVD casting sample, whereas rod-like β-Mg₂Si precipitates distribute in the aluminum matrix in the PM casting.

【 授权许可】

Unknown