應(yīng)力腐蝕敏感性的影響
(中南大學(xué) 材料科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 選用3種不同的熱處理工藝對(duì)2519鋁合金板材進(jìn)行處理， 采用測(cè)定試樣在腐蝕前后力學(xué)性能的變化即腐蝕的力學(xué)性能指標(biāo)Kσ和Kδ來(lái)評(píng)定2519鋁合金的應(yīng)力腐蝕敏感性。 結(jié)果表明： 2519鋁合金板材經(jīng)先高溫后低溫的雙級(jí)時(shí)效處理(180℃，3h+145℃， 24h)后力學(xué)性能最好， 抗應(yīng)力腐蝕性能最差； 而經(jīng)形變熱處理(20℃， 100h+冷加工15%+145℃，21h)后的力學(xué)性能較好， 抗應(yīng)力腐蝕性能最好； 過(guò)時(shí)效狀態(tài)(180℃，30h)下力學(xué)性能最差， 抗應(yīng)力腐蝕性能適中。
關(guān)鍵字: 2519鋁合金； 熱處理； 力學(xué)性能； 應(yīng)力腐蝕敏感性
2519 aluminum alloy plate
（School of Material Science and Engineering,
Central South University, Changsha 410083, China）
Abstract:Three different heat treatment processes were selected for 2519 aluminum alloy plate, the stress corrosion sensitivity was evaluated by difference of mechanical properties between corroded samples and un-corroded samples such as Kσ and Kδ. The results show that the stress corrosion resistance of the alloy is the worst but its mechanical properties are the best at two-stage aging state of 180℃, 3h+145℃, 24h; the stress corrosion resistance is the best but the mechanical properties are in the middle of three states at the thermal-mechanical treatment state of 20℃, 100h+cool deformation 15%+145℃, 21h; the stress corrosion resistance is in the middle of three states but the mechanical properties are the worst at the state of over-aging of 180℃, 30h.
Key words: heat treatment; 2519 aluminum alloy; mechanical property; stress corrosion sensitivity
