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一、前言АЛ9合金系硅铝合金之一,其主要成分为:6～8%Si,0.2～0.4%Mg,其余为 Al。Mg 的加入使合金有了可热处理的性质,因而该合金通常进行淬火处理。АЛ9合金的淬火规范通常采用535±5℃保温6小时后淬入50～100℃水中。从理论上讲,АЛ9合金的淬火温度偏离三元共晶熔点(557℃)较远,不可能出现过烷现象。但由于铸造合金的组织特点:粗大的组织、第二相的不均匀性和含低熔点的杂质较多,过烧的危险性依然存在。而在目前的生产中对АЛ9合金的过烧检查尚
I. Introduction АЛ9 alloy is one of silicon-aluminum alloy, the main components are: 6 ~ 8% Si, 0.2 ~ 0.4% Mg, the balance of Al. The addition of Mg renders the alloy heat-treatable so the alloy is usually quenched. АЛ9 alloy quenching specifications are usually used 535 ± 5 ℃ incubated for 6 hours after quenching 50 ~ 100 ℃ water. Theoretically, the quenching temperature of АЛ9 alloy is far away from the melting point of the ternary eutectic (557 ºC), so it is impossible to produce the paraffin. However, due to the organizational characteristics of the cast alloy: coarse tissue, the second phase of non-uniformity and low melting point impurities are more over-burning danger still exists. In the current production of АЛ9 alloy over-burning inspection is still