ABSTRACT

The current study investigated the effect of heat treatment parameters, including solution treatment temperature (STT), time, and quench rate, on the microstructure, defects, and hardness of an Al-16Si-6Cu Shift fork die-cast alloy. The changes in primary silicon particle (PSP) features were examined quantitatively by optical microscopy, coupled with image analysis and SEM equipped with EDS. The biggest PSPs (27 ± 8 µm) and the highest area fraction (23%) were found in the sample solution treated at 470°C and cooled in the furnace. The hardness value increased in heat-treated samples slightly (140–148 BHN). A lower STT (420°C) and a lower ageing time (1 h) are suitable conditions for the heat treatment of an Al-16Si-6Cu die-cast alloy, in which a lower pore area fraction, 1.18, smaller pore, 4.5 μm, along with finer primary silicon, 9.5 ± 3 μm, with higher circularity, 0.38 ± 0.04, was achieved.

摘要

目前的研究调查了热处理参数（包括固溶处理温度 (STT)、时间和淬火速率）对 Al-16Si-6Cu Shift 压铸合金的显微组织、缺陷和硬度的影响。通过光学显微镜、图像分析和配备 EDS 的 SEM 定量检查初级硅颗粒 (PSP) 特征的变化。在 470°C 处理并在炉中冷却的样品溶液中发现最大的 PSP (27 ± 8 µm) 和最高的面积分数 (23%)。热处理样品的硬度值略有增加（140-148 BHN）。较低的 STT (420°C) 和较短的时效时间 (1 h) 是 Al-16Si-6Cu 压铸合金热处理的合适条件，其中较低的孔隙面积分数，1.18，较小的孔隙，4.5 μm，以及更精细的初级硅，9.5 ± 3 μm，