Abstract
Effects of trace amounts of embrittling impurities on intergranular fracture were studied using Al-Mg and Al-Cu alloys and mechanisms of intergranular fracture affected by such impurities are discussed. In a coarse-grained Al-5%Mg alloy, 0.5 ppm of sodium was enough to cause severe embrittlement at high temperatures but this detrimental effect was removed by adding antimony or bismuth. Besides sodium, calcium and strontium also promoted intergranular fracture in an Al-5%Mg alloy. Intergranular fracture in Al-4%Cu alloys was evaluated using samples with different precipitate microstructures. The impurity sulfur had a detrimental effect at ambient temperature, while the effect of sulfur disappeared at 77 K.
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