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局部腐蝕對不同熱處理狀態(tài)7055鋁合金拉伸性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時間：2015-12-08
通過室溫拉伸、金相顯微鏡、掃描電鏡和透射電鏡研究晶間和剝落腐蝕對T6態(tài)、RRA態(tài)和T73態(tài)7055鋁合金板材拉伸性能的影響。
局部腐蝕對不同熱處理狀態(tài)7055鋁合金拉伸性能的影響Effects of local corrosion on tensile properties of?7055 aluminum alloys after different aging treatments
通過室溫拉伸、金相顯微鏡、掃描電鏡和透射電鏡研究晶間和剝落腐蝕對T6態(tài)、RRA態(tài)和T73態(tài)7055鋁合金板材拉伸性能的影響。結(jié)果表明：腐蝕后板材的強度和伸長率均降低，但伸長率的降低程度比強度的降低程度更大；剝落腐蝕后的性能降低程度大于晶間腐蝕后的；腐蝕后，RRA態(tài)板材的強度最高，T73板材的伸長率最高；剝落腐蝕后的T6態(tài)板材拉伸時發(fā)生脆性斷裂；T6態(tài)板材腐蝕后拉伸性能的降低程度最大，RRA態(tài)的其次，T73態(tài)的最??；板材腐蝕后，表層產(chǎn)生大量腐蝕缺口和沿晶微裂紋，增大拉伸過程的裂紋源數(shù)量，降低拉伸性能；晶界上第二相粒子的尺寸、分布狀態(tài)影響板材腐蝕后的損傷程度，進而影響拉伸性能的下降程度。
The effects of intergranular corrosion and exfoliation corrosion exposure on the tensile properties of T6-, RRA- and T73-treated 7055 aluminum alloy sheets were investigated by ambient tensile test, optical microscopy, scanning electron microscopy and transmission electron microscopy. The results show that the strength and elongation decrease after exfoliation corrosion, the drop percentage is significantly higher for the elongation than that for the strength. The drop percentage in the tensile properties after exfoliation corrosion is higher than that after intergranular corrosion. After corrosion, the strength is the highest for RRA-treated sheet, and the elongation is the highest for T73-treated sheet. For the T6-treated sheet subjected to exfoliation corrosion, brittle fracture occurs during tensile test. The drop percentage in the properties due to corrosion is the highest for the T6-treated sheet, intermediate for the RRA-treated sheet and the lowest for the T73-treated sheet. Many notches and intergranular microcracks are present on the surface of the sheet due to corrosion, and this increases the number of the crack sources, thus deteriorates the tensile properties. The size and distribution of the second phase at grain boundaries have influence on the degree of corrosion damage, consequently the drop percentage in the tensile properties.
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