時效處理對7050鋁合金厚板材料組織、性能及殘余應力的影響

時效處理對7050鋁合金厚板材料組織、性能及殘余應力的影響Effects of aging on microstructures, properties and residual stress of 7050 aluminum alloy

采用末端淬火實驗、剝落腐蝕實驗、透射電鏡(TEM)和X射線殘余應力測量儀等方法研究不同時效處理制度對7050鋁合金厚板材料組織、性能及殘余應力的影響。結果表明： T74時效狀態(tài)試樣較T6時效狀態(tài)試樣沿整個冷卻方向上力學性能更加均勻；T74時效狀態(tài)試樣的剝落腐蝕性能較T6有顯著提高，且淬火冷卻速度對T74狀態(tài)影響不大；沿整個淬火冷卻方向上T74時效狀態(tài)試樣殘余應力水平較T6時效狀態(tài)試樣明顯降低。

The effects of different aging on microstructure, properties and residual stress of 7050 aluminum alloy were investigated by end quenching test, exfoliation corrosion test, transmission electron microscopy (TEM) and residual stress test. The results show that the mechanical properties of the T74 temper are more uniform than that of the T6 temper along the direction of the cooling. Not only the exfoliation corrosive nature of the T74 temper is significantly higher than that of the T6 temper, but also the cooling velocity has little effect on it. Furthermore, the distribution of the residual stress is obviously reduced along the cooling direction.

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