本文選題：高強(qiáng)鋁合金 + 超低溫變形��； 參考：《金屬學(xué)報(bào)》2017年09期

【摘要】：通過低溫冷卻+軋制變形的方法研究了高強(qiáng)7050鋁合金的低溫塑性變形及其對(duì)合金組織性能的影響。結(jié)果表明,高強(qiáng)7050鋁合金經(jīng)液氮冷卻預(yù)處理后可實(shí)現(xiàn)與溫/熱軋相比較高的軋制變形加工量,并產(chǎn)生大量亞結(jié)構(gòu)和高密度位錯(cuò),使合金顯著強(qiáng)化,其中低溫下的高變形能力主要與合金在低溫下具有高的加工硬化能力密切相關(guān),而強(qiáng)度提升主要來自于固溶強(qiáng)化和變形位錯(cuò)強(qiáng)化的貢獻(xiàn)。雖然超低溫變形能夠明顯加快淬火態(tài)高強(qiáng)7050鋁合金的時(shí)效進(jìn)程,但直接時(shí)效處理可使超低溫變形態(tài)7050鋁合金保有較高的強(qiáng)度和一定延伸率,其中析出和位錯(cuò)強(qiáng)化是其強(qiáng)化主因,而時(shí)效引起的回復(fù)和強(qiáng)化相析出共同促進(jìn)延伸率的改善。淬火態(tài)高強(qiáng)7050鋁合金在室溫變形過程中,形變熱引起基體中析出的溶質(zhì)原子團(tuán)簇(或GP區(qū))和η′相與變形位錯(cuò)發(fā)生交互作用,導(dǎo)致大量剪切帶(失穩(wěn)區(qū))形成,從而易引發(fā)軋板開裂或邊裂,而超低溫變形過程中溶質(zhì)擴(kuò)散受阻以致強(qiáng)化相析出被抑制,從而明顯降低了剪切失穩(wěn)區(qū)的發(fā)生,使合金能夠獲得均勻、穩(wěn)定的塑性變形或良好的加工硬化,確保獲得較高質(zhì)量的超低溫軋板。高強(qiáng)鋁合金在低溫下所表現(xiàn)出來的優(yōu)異塑性變形和加工能力有望成為改善高強(qiáng)鋁合金難變形加工的有效途徑。
[Abstract]:The low temperature plastic deformation of high strength 7050 aluminum alloy and its effect on microstructure and properties were studied by means of low temperature cooling rolling deformation. The results show that the high strength 7050 aluminum alloy can achieve higher rolling deformation rate than that of warm / hot rolling phase after pretreatment with liquid nitrogen, and produce a large number of substructure and high density dislocations, which make the alloy strengthened significantly. The high deformation capacity at low temperature is mainly related to the high work hardening ability of the alloy at low temperature, while the enhancement of strength comes mainly from the contribution of solid solution strengthening and deformation dislocation strengthening. Although the aging process of quenched high-strength 7050 aluminum alloy can be accelerated obviously by ultra-low temperature deformation, direct aging treatment can make 7050 aluminum alloy keep higher strength and certain elongation, in which precipitation and dislocation strengthening are the main causes of strengthening. The precipitation of recovery and strengthening phase induced by aging promotes the improvement of elongation. During the deformation of quenched high strength 7050 aluminum alloy at room temperature, the deformation heat results in the interaction between solute cluster (or GP region) and 畏 'phase in the matrix and the deformation dislocation, resulting in a large number of shear bands (instability zone). It is easy to lead to cracking or edge crack of rolling plate, and the solute diffusion is blocked during ultra-low temperature deformation, so that the precipitation of strengthening phase is restrained, which obviously reduces the occurrence of shear instability zone and makes the alloy uniform. Stable plastic deformation or good work hardening to ensure high quality ultra-low-temperature rolling plate. The excellent plastic deformation and processing ability of high strength aluminum alloy at low temperature is expected to be an effective way to improve the deformation resistance of high strength aluminum alloy.
【作者單位】： 北京科技大學(xué)新金屬材料國家重點(diǎn)實(shí)驗(yàn)室;北京科技大學(xué)冶金與生態(tài)工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目No.51401016 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目No.FRF-TP-12-137A 現(xiàn)代交通金屬材料與加工技術(shù)北京實(shí)驗(yàn)室項(xiàng)目 新金屬材料國家重點(diǎn)實(shí)驗(yàn)室基金項(xiàng)目No.2011Z-05~~
【分類號(hào)】：TG146.21

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