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熱處理工藝對2A97鋁鋰合金拉伸性能和腐蝕性能的影響
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更新時間：2015-10-17
研究不同熱處理工藝對2A97鋁鋰合金拉伸性能和腐蝕性能的影響。
熱處理工藝對2A97鋁鋰合金拉伸性能和腐蝕性能的影響Effects of heat treatment process on tensile and corrosion properties of 2A97 Al-Li alloy
研究不同熱處理工藝對2A97鋁鋰合金拉伸性能和腐蝕性能的影響。結(jié)果表明：合金經(jīng)熱處理工藝C(5%預(yù)變形+100 ℃, 1.5 h+5%中間變形+160 ℃,?t)處理后，獲得較好的強度與塑性的配比，在峰時效狀態(tài)下，合金抗拉強度和伸長率分別為597 MPa和7.4%。同時，合金耐晶間腐蝕性能優(yōu)異，平均晶間腐蝕深度為22 μm。在分步變形和雙級時效的綜合作用下，合金在峰時效晶內(nèi)獲得大量彌散細小的T1相和少量的S′相，晶界處析出相稀少，無沉淀析出帶不明顯，使2A97合金獲得高強度的同時，改善塑性和耐晶間腐蝕性能。
The effects of various heat treatment processes on tensile and corrosion properties of 2A97 Al-Li alloy were investigated. The results show that, undertaken with heat treatment process C (pre-deformation 5%+100 ℃, 1.5 h+mid-deformation 5%+160 ℃,?t), the alloy obtains preferable combination of strength and ductility. At the peak-aged condition of heat treatment process C, the tensile strength and elongation of 2A97 Al-Li alloy are 597 MPa and 7.4%, respectively. Meanwhile, the intergrannular corrosion resistant is excellent, and the average intergranular corrosion depth is 22 μm. Under the comprehensive function of multi-step deformation and two-step aging, the large quantities of?T1?precipitate dispersedly in grain with?some?S′?phase, few second phases precipitate in grain boundary, and the precipitation free zone is not obviously near grain boundary, which respond to the favorable tensile properties and corrosion properties of 2A97 Al-Li alloy at peak-aged.
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