Semi-solid isothermal heat treatment was proposed to directly process cold-rolled ZL104 aluminum alloys and obtain semi-solid billets. The effects of two process parameters, namely, temperature and processing time, on the microstructure and hardness of the resulting billets were also experimentally examined. Average grain size (AGS) increased and the shape factor (SF) of the grain improved as the process temperature increased. The SF of the grain also increased with increasing processing time, and the AGS was augmented when the processing time was prolonged from 5 to 20 min at 570°C. The hardness of the aluminum alloy decreased because of the increase in AGS with increasing temperature and processing time. The optimal temperature and time for the preparation of semi-solid ZL104 aluminum alloys were 570°C and 5 min, respectively. Under optimal process parameters, the AGS, SF, and hardness of the resulting alloy were 35.88 µm, 0.81, and 55.24 MPa, respectively. The Lifshitz-Slyozov-Wagner relationship was analyzed to determine the coarsening rate constant at 570°C, and a rate constant of 1357.2 µm³/s was obtained.

提出半固态等温热处理直接加工冷轧ZL104铝合金，获得半固态坯料。两个工艺参数，即温度和加工时间，对所得坯料的微观结构和硬度的影响也进行了实验研究。随着加工温度的升高，平均晶粒尺寸 (AGS) 增加，晶粒的形状因子 (SF) 提高。谷物的 SF 也随着加工时间的增加而增加，当加工时间在 570°C 下从 5 分钟延长到 20 分钟时，AGS 会增加。由于 AGS 随温度和加工时间的增加而增加，铝合金的硬度降低。制备半固态 ZL104 铝合金的最佳温度和时间分别为 570°C 和 5 min。在最佳工艺参数下，所得合金的 AGS、SF 和硬度分别为 35.88 µm、0.81 和 55.24 MPa。分析 Lifshitz-Slyozov-Wagner 关系以确定 570°C 下的粗化速率常数和 1357.2 µm 的速率常数获得³ /s。