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已经研究了氢脆在A1-Mg合金应力腐蚀开裂中所起的作用.根据实验结果,提出了应力腐蚀裂纹的形成和扩展的下述模型.第一,裂纹源心由机械-化学腐蚀产生的.第二,由腐蚀产生了氢气,而氢气由裂纹尖端前面的塑性区的位错运动向前输送.由于铝合金的晶界对腐蚀一般是敏感的,并且氢气也易于在晶界集中,所以,沿晶界形成了氢影响区.第三,在氢脆、应力集
The role of hydrogen embrittlement in stress corrosion cracking of A1-Mg alloys has been studied.According to the experimental results, the following models for the formation and propagation of stress corrosion cracking have been proposed: First, the source of the crack nuclei is produced by mechanochemical corrosion Second, hydrogen gas is produced by corrosion and hydrogen is transported forward by the dislocation motion of the plastic zone in front of the crack tip Because the grain boundaries of the aluminum alloy are generally sensitive to corrosion, and hydrogen is also liable to concentrate at the grain boundaries, , Along the grain boundary formed a hydrogen-affected zone.Third, in hydrogen embrittlement, stress set