Suppression of the brittle grain boundary fracture of aluminum alloys by means of soaking in a liquid metal bath

Al-Mg基合金在高温下表现出晶界脆性，这是由于钠在晶界偏聚引起的。据报道，为了抑制脆化，添加与钠有高亲和力的铋或锑等元素是有效的。为了提高Al-Mg基合金的热塑性，提出了一种通过在液态金属浴中浸泡的方法添加元素的新方法。结果表明，浸泡在液态铋中可以抑制高温脆化。另一方面，在液铟浸泡过程中，浸泡温度不同，影响效果也不同。

Al-Mg base alloys show grain boundary embrittlement at high temperatures caused by the segregation of sodium at grain boundaries. To suppress the embrittlement, it has been reported that the additional elements such as bismuth or antimony with high affinity with sodium are effective. In the present study, a novel method to add the elements was proposed by means of soaking in liquid metal baths to imporve the hot ductility of Al-Mg base alloys. As a result, it was revealed that the soaking in liquid bismuth could suppress the high temperature embrittlement. On the other hand in the soaking in liquid indium bath, it was shown that the effects were variable according to the temperature of soaking.