拉伸延性模型
SUN Jun1，CHEN Kang-hua3
(1. 西安交通大學(xué) 材料科學(xué)與工程學(xué)院
金屬材料強(qiáng)度國(guó)家重點(diǎn)實(shí)驗(yàn)室，西安 710049；
2. 西安理工大學(xué) 材料科學(xué)與工程學(xué)院，西安 710048；
3. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn) 實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 基于合金中不同尺度第二相在其斷裂過(guò)程中的作用機(jī)制及位錯(cuò)理論，建立了高強(qiáng)鋁合金中結(jié)晶相、沉淀相以及析出強(qiáng)化相性質(zhì)與其拉伸延性間的多元非線性關(guān)系模型。結(jié)果表明對(duì)于2024鋁合金的拉伸延性，該模型的預(yù)測(cè)值與相應(yīng)的實(shí)驗(yàn)值吻合良好。同時(shí)借助于該模型的理論分析，可以得到在確保高強(qiáng)鋁合金強(qiáng)度不降低的前提下提高其延性的優(yōu)化方案。
關(guān)鍵字: 鋁合金；多級(jí)第二相；拉伸延性；模型
strength Al alloys containing second
particles of various sized scales
SUN Jun1，CHEN Kang-hua3
（1. State Key Laboratory for Mechanical Behavior of Materials,
School of Materials Science and Engineering,
Xi′an Jiaotong University, Xi′an 710049, China;
2. School of Materials Science and Engineering,
Xi′an University of Technology, Xi′an 710048, China;
3. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract:A model was established for high strength aluminum alloys to present a nonlinear relation between the tensile ductility of the alloys with the characteristics of constituents, dispersoids, and precipitates within the alloys, bas ed on both the roles of three second-particles with various sized scales in the failure and the dislocation mechanism. The results show that the ductility to fracture obtained experimentally is well agreed with that predicted by the model for an aged 2024 aluminum alloy. Moreover, an optimum could be approached to promote the ductility, as well as maintain the strength of the alloys by means of comprehensive analyses to the model.
Key words: aluminum alloys；second phase particles of various sizes；tensile ductility；model
