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为减少或防止热裂现象的产生,研究具有长程凝固区A713铸态铝合金的热裂行为。对添加不同晶粒细化剂如Al-2.5Ti-0.5C和Al-3.5Ti-1.5C的合金在不同浇铸温度(700、750和780°C)条件下进行热裂实验。结果表明:添加晶粒细化剂Al-3.5Ti-1.5C能减少热裂现象的产生,但仅添加晶粒细化剂不能完全阻止A713铸态铝合金中热裂现象的产生。这与早期一些研究者得出的结论相矛盾。考察了铁元素对A713铸态铝合金热裂行为的影响。结果显示,同时添加晶粒细化剂和铁元素能减少A713铝合金的内部枝晶分离,从而沿晶界产生枝晶间的联锁。因此,铁元素作为工业铝中的一种杂质元素,能阻止A713铝合金热裂现象的产生。
In order to reduce or prevent the phenomenon of thermal cracking, the thermal cracking behavior of the as-cast aluminum alloy A713 with long-range solidification zone was studied. Thermal cracking experiments were performed on the alloys with different grain refiners, such as Al-2.5Ti-0.5C and Al-3.5Ti-1.5C, at different casting temperatures (700, 750 and 780 ° C). The results show that the addition of grain refiner Al-3.5Ti-1.5C can reduce the phenomenon of thermal cracking. However, the addition of grain refiner can not completely prevent the occurrence of thermal cracking in A713 cast aluminum alloy. This contradicted the conclusions drawn by some earlier researchers. The effect of iron on the thermal cracking behavior of A713 cast aluminum alloy was investigated. The results show that the simultaneous addition of grain refiner and iron can reduce the internal dendritic separation of A713 aluminum alloy, resulting in interlocking between dendrites along the grain boundaries. Therefore, iron as an impurity element in industrial aluminum, can prevent A713 aluminum alloy thermal cracking phenomenon.