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取向對含鈧2124鋁合金抗應力腐蝕開裂行為的影響
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時間：2015-08-26
采用光學顯微鏡和掃描電鏡等研究新型含鈧2124鋁合金兩種不同取向試樣在3.5%NaCl(質量分數(shù))溶液中的應力腐蝕開裂行為，并對裂紋尖端形貌和腐蝕形貌進行分析。
取向對含鈧2124鋁合金抗應力腐蝕開裂行為的影響Influence of sampling orientation on stress corrosion
cracking resistant behavior of 2124 aluminum alloy containing Sc
采用光學顯微鏡和掃描電鏡等研究新型含鈧2124鋁合金兩種不同取向試樣在3.5%NaCl(質量分數(shù))溶液中的應力腐蝕開裂行為，并對裂紋尖端形貌和腐蝕形貌進行分析。結果表明：該鋁合金在應力腐蝕時首先發(fā)生陽極溶解，裂紋尖端晶界處大量聚集的腐蝕產物產生的楔入力和外加應力的共同作用促使預制裂紋在腐蝕介質中進一步沿晶界向縱深方向擴展；兩種取向試樣在全浸腐蝕時均發(fā)生明顯的晶間腐蝕，容易發(fā)生應力腐蝕開裂；得到了不同取向試樣的應力腐蝕裂紋擴展規(guī)律及應力腐蝕強度因子門檻值，并探討取向對應力腐蝕開裂行為的影響。
The stress corrosion cracking behavior of the novel 2124
aluminum alloy containing Sc with different sampling orientations in 3.5%NaCl
(mass fraction) solution was studied by optical microscopy and scanning electron
microscopy. Furthermore, the morphologies at the crack tip before and after
corrosion were analyzed. The results show that the anodic dissolution occurs
first during the stress corrosion, and the cooperation of the wedging action
incured by the mass of corrosion products gathering at the grain boundaries and
the applied stress drives the pre-cracks extending along the grain boundaries to
the depth direction further in the corrosive medium. Obvious intergranular
corrosion of the samples of the two orientations occurs under the total
immersion corrosion and stress corrosion cracking takes places easily. The
stress corrosion crack propagation law and the stress corrosion intensity factor
threshold of the samples of different orientations are obtained. The effect of
the sampling orientation on the stress corrosion cracking behavior was
investigated.
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