一、前言ZL-104、ZL-101均系Al-Si-Mg系合金,其使用状态ZL-104一般为T_1、T_5或T_6,ZL-101一般为T_4或T_5,根据HB962-70说明书的规定,合金经热处理以后,需进行金相过烧检查,由于目前还没有统一的过烧金相标准,对过烧的判断也不一致。本试验着重对以下几点进行一些探讨:1.合金过烧的显微特征及其变化机理; Preface ZL-104 and ZL-101 are all Al-Si-Mg based alloys. Their working condition ZL-104 is generally T_1, T_5 or T_6. ZL-101 is generally T_4 or T_5. According to the instructions of HB962-70 After the heat treatment of the alloy, the metallurgical overheating inspection is required. Since there is no uniform standard for overheating metallurgical, the judgment of overheating is also inconsistent. This experiment focuses on the following discussion: 1 microscopic characteristics of overburned alloy and its change mechanism;