(1. 常州大學(xué) 材料科學(xué)與工程學(xué)院，常州 213164；
2. 常州大學(xué) 江蘇省材料表面科學(xué)與技術(shù)重點(diǎn)實(shí)驗(yàn)室，常州 213164)
摘 要: 采用流變應(yīng)力差值法，研究不同時效狀態(tài)7050鋁合金在不同充氫電流密度下的氫致附加應(yīng)力(σad)以及合金的氫脆特性。結(jié)果表明：在同一時效狀態(tài)下，氫致附加應(yīng)力隨氫濃度的增加而線性升高；同時，合金氫脆敏感性(IHE)也隨著氫濃度的升高而升高，表明合金氫脆敏感性與氫致附加應(yīng)力有很強(qiáng)的相關(guān)性。在同一充氫電流密度下，時效狀態(tài)對氫致附加應(yīng)力和氫脆敏感性影響很大，其中欠時效合金的σad和IHE最高，過時效合金的最低，峰時效合金的居中。
關(guān)鍵字: 7050鋁合金；氫脆；氫致附加應(yīng)力；時效
（1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. Jiangsu Key Laboratory of Materials Surface Science and Technology,
Changzhou University, Changzhou 213164, China）
Abstract:The hydrogen-induced additive stress (σad) and hydrogen embrittlement of 7050 aluminum alloy at various aging states and different hydrogen charging current densities were investigated by flowing stress differential method. The results show that the hydrogen-induced additive stress of 7050 aluminum alloy with the same aging state increases linearly with increasing the hydrogen concentration; simultaneously, the susceptibility to hydrogen embrittlement (IHE) of 7050 aluminum alloy also increases with increasing the hydrogen concentration, which suggests that IHE is closely related to σad. At the same hydrogen charging current density, aging state has a great influence on σad and IHE, the σad and IHE of under-aged state alloy are of the highest, those of the over-aged state alloy are of the lowest, and those of peak aged are in the middle.
Key words: 7050 aluminum alloy; hydrogen embrittlement; hydrogen-induced additive stress; aging
