( 1. 中南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410083；
2. 中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083;
3. 長沙大學(xué)應(yīng)用化學(xué)與環(huán)境科學(xué)系，長沙410003)
摘 要: 通過力學(xué)性能測試和顯微組織觀察研究了2197合金組織和性能之間的關(guān)系。 結(jié)果表明： 2197合金具有中等強(qiáng)度、 各向異性小、熱穩(wěn)定性好等特點(diǎn)； 該合金在T8狀態(tài)下能獲得最佳的強(qiáng)度和塑性配合，在T6時(shí)效狀態(tài)以析出少量δ′、θ′和T1相聯(lián)合強(qiáng)化為主； 在2197合金的相組成中T1相析出數(shù)量不占主導(dǎo)地位，Al6Mn彌散質(zhì)點(diǎn)的析出有利于減少各向異性； 2197合金中Li含量較低，使其呈現(xiàn)較好的熱穩(wěn)定性。
關(guān)鍵字: 2197鋁-鋰合金; 顯微組織; 拉伸性能; 各向異性; 熱穩(wěn)定性
2197 Al-Li alloy
（ 1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China;
3. Department of Applied Chemistry and Environmental Science,
Changsha University, Changsha 410003, China）
Abstract: The relationship between microstructure and properties(including mechanical properties, thermal stability and anisotropy) of 2197Al-Li alloy was studied by tensile test and TEM. The results indicate that 2197 alloy is an alloy with moderate strength, little anisotropy and better thermal stability. 2197 alloy can obtain the optimistical combination of the strength and ductility in T8 temper. The major strengthening phases are a few δ′ particles, θ′ and T1 phases at peakaged condition in T6 temper in 2197 alloy. It is good for lowering the anisotropy because T1 precipitate is not dominant in all precipitates and dispersoid Al6Mn particles precipitate in 2197 alloy. Lower Li concentration makes 2197 alloy have better thermal stability.
Key words: 2197 Al-Li alloy; microstructure; tensile property; anisotropy; thermal stability
