Gallium-induced magnesium enrichment on grain boundary and the gallium effect on degradation of tensile properties of aluminum alloys
作者： Jun-Yen Uan , Cheng-Chia Chang
DOI: 10.1007/BF02586134
关键词:
摘要: By applying a controlled amount of gallium (3 mg or 5 mg) to double-notched samples, the effects on grain boundary chemistry and tensile properties AA6061-T4 alloy were investigated. Commercial-purity aluminum AA1050 was used for comparison determine whether alloying elements would correlate with Ga-induced embrittlement elucidate physical reason that governed occurrence intergranular fracture in AA6061 Al-Mg-Si alloy. The samples wetted by 3 Ga held statically 7 days before tests conducted. 6061 fractured intergranularly. However, Ga-treated had mixed mode, showing better strength ductility than alloy, independent their longitudinal axis parallel perpendicular rolling direction, holding temperatures tests. Auger electron spectroscopy scanning facets surfaces showed peak-to-peak ratio IGa/IAl similar 1050 but high intensity Mg signal detected from surface Magnesium being induced enrich free confirmed. T4 small involves combination following two effects: metal embrittlement, magnesium enrichment further decreases boundary.
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