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一、绪言一般认为,含Mg约5％(重量百分比)以上的Al—Mg合金,通常,在500～700开氏温度区域会出现由于晶界破坏而产生的低延性现象(高温脆化现象)。然而根据最近作者的研究结果表明,在惰性气氛中熔化时,高温脆化现象显著减少。这一结果暗示高温脆化现象是和空气中的气体不纯物(氧、氢等)有关。因此,作者对熔化气氛、退火气氛(含氧、水蒸汽等)对Al—5％Mg合金高温延性的影响进行了研究,弄清了高温脆化现象是由哪种气体元素造成的。
I. INTRODUCTION It is generally accepted that Al-Mg alloys containing about 5% by weight or more of Mg generally exhibit low ductility (high-temperature embrittlement) due to grain boundary damage in the temperature range of 500 to 700 Kelvin, . However, according to a recent study by the authors, it has been shown that there is a significant reduction in high temperature embrittlement when molten in an inert atmosphere. This result suggests that the phenomenon of high temperature embrittlement is related to gaseous impurities in the air (oxygen, hydrogen, etc.). Therefore, the author has studied the influence of melting atmosphere, annealing atmosphere (including oxygen, water vapor, etc.) on high temperature ductility of Al-5% Mg alloy, and clarified which kind of gas element causes high temperature embrittlement.