預(yù)變形量對(duì)2519A-T9I6鋁合金力學(xué)性能和組織的影響

預(yù)變形量對(duì)2519A-T9I6鋁合金力學(xué)性能和組織的影響Effects of pre-deformation on microstructure and mechanical properties of 2519A-T9I6 aluminum alloy

研究預(yù)變形量對(duì)經(jīng)T9I6工藝處理的2519A鋁合金組織和力學(xué)性能的影響。通過(guò)顯微硬度測(cè)試、室溫拉伸測(cè)試檢測(cè)合金的室溫力學(xué)性能，采用透射電鏡(TEM)和高分辨透射電鏡(HRTEM)分析合金的顯微組織。結(jié)果表明：當(dāng)預(yù)變形量為15%時(shí)，合金的屈服強(qiáng)度和抗拉強(qiáng)度取得最大值，分別為456.1 MPa和501.6 MPa，繼續(xù)增大預(yù)變形量會(huì)導(dǎo)致強(qiáng)度下降；而合金的伸長(zhǎng)率隨著預(yù)變形量的增大而逐漸下降。2519A鋁合金在T9I6工藝中強(qiáng)化方式主要為形變強(qiáng)化和析出強(qiáng)化；合金的形變強(qiáng)化效果隨著預(yù)變形量的增大有增大的趨勢(shì)，但提升幅度逐漸減小。預(yù)變形過(guò)程中引入的位錯(cuò)能夠與合金在預(yù)時(shí)效階段析出的GP區(qū)相互作用，從而改善位錯(cuò)分布。當(dāng)預(yù)變形量增大時(shí)，基體內(nèi)會(huì)發(fā)生回復(fù)作用導(dǎo)致位錯(cuò)密度減少，且后續(xù)時(shí)效過(guò)程中GP區(qū)析出被抑制，對(duì)強(qiáng)化相θ′相的形核產(chǎn)生不利影響，減弱析出強(qiáng)化的效果。

The effects of pre-deformation on microstructure and mechanical properties of T9I6 interrupted-aged 2519A aluminum alloy were investigated by transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), hardness tests and tensile tests. The results show that when the pre-deformation rate is 15%, both the yield strength and tensile strength of the alloy get their highest values, 456.1 MPa and 501.6 MPa, respectively. Further increasing the pre-deformation rate will decrease the strength. While the elongation decreases with increasing the pre-deformation rate. The mechanical properties of 2519A alunimiun in T9I6 treatment are contributed mainly by strain hardening and age hardening. The effect of strain hardening tends to increase with increasing the pre-deformation rate, but the rate of increase gradually reduces. The dislocation introduced by strain can interact with GP zones formed during pre-ageing and improve the distribution of dislocation. If the pre-deformation rate is too large, the occurring of recovery can decrease the density of dislocations. Also, the formation of GP zones in the following process will be inhibited, which can adversely affect the nucleation of θ′ precipitates and reduce the effect of age hardening.

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