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对AA24M标准牌号合金进行了详细的研究,得到该合金的成份如下: 3.0～5.0％Mg;3.5～6.0％Zn;0.2～0.5％Mn;0.1～0.4％Ti;0.1—0.3％Cr,0.1～0.4％Zr;0.1～0.3％Ce;0.05～0.15％Be;余为Ae(A_(99)或A_(97)铝),杂质铁和硅含量小于0.1％,Mg和Zn的总含量不得高于8％。难熔的合金元素以中间合金形式加入。为了保护合金不至氧化,在炉内化铝的同时,还应加入Al—Be中间合金。为了除气和精炼,合金熔炼到740～750℃时,加入0.4～0.5％六氯乙烷,分3～4批进行。根据热裂性标准试样试验,在环宽度为22.5mm(浇注温度700℃)时,合金形成第一道
The AA24M standard grade alloy has been studied in detail. The composition of the alloy is as follows: 3.0-5.0% Mg, 3.5-6.0% Zn, 0.2-0.5% Mn, 0.1-0.4% Ti, 0.1-0.3% Cr, 0.4% Zr; 0.1-0.3% Ce; 0.05-0.15% Be; the balance being Ae (A 99 or A 97), the content of iron and silicon in the impurities is less than 0.1%, and the total content of Mg and Zn is not higher than 8%. The refractory alloying element is added as an intermediate alloy. In order to protect the alloy from oxidation, the Al-Be master alloy should be added at the same time as the aluminum in the furnace. In order to degassing and refining, the alloy melting to 740 ~ 750 ℃, adding 0.4 to 0.5% hexachloroethane, divided into 3 to 4 batches. According to the hot crack test of the standard sample, the ring width of 22.5mm (pouring temperature 700 ℃), the alloy formed the first