论文部分内容阅读
长时期以来就已推测到,氢气扩散致使晶界脆化,成为AlZnMg型高强度结构材料出现直力腐蚀开裂(SpRK)的原因。近几年,支持这种观点的研究资料积累得越来越多,直到不久前能够用一种模拟实验来证实。由铝和水的腐蚀介质反直所形成的氢扩散到晶界,并且因其内聚力衰减致使其断裂强度下降,以至在弹性应力范围内发生晶间脆断。这里,
It has been speculated for a long time that the diffusion of hydrogen causes grain boundary embrittlement, which is the reason for the occurrence of direct corrosion cracking (SpRK) in AlZnMg high strength structural materials. In recent years, research data supporting this view have accumulated more and more until recently, using a simulation experiment. The hydrogen formed by the counteraction of the corrosive media of aluminum and water diffuses to the grain boundaries and its breaking strength decreases due to its cohesion decay so that intergranular brittle fracture occurs within the elastic stress range. Here,