組織和力學(xué)性能的影響
(1. 沈陽大學(xué) 機(jī)械工程學(xué)院, 沈陽 110044；2. 東北大學(xué) 材料與冶金學(xué)院，沈陽 110004)
摘 要: 采用單輥攪拌冷卻技術(shù)(Shearing-cooling-rolling，簡稱SCR技術(shù))和在線固溶處理方法制備Al-3Mg-0.5Sc合金線材，研究不同熱處理工藝對合金線材的微觀組織和力學(xué)性能的影響。結(jié)果表明： SCR技術(shù)對合金線材產(chǎn)生強(qiáng)烈的單輥剪切塑性變形，在鋁基體中產(chǎn)生大量的位錯及初生Al3Sc強(qiáng)化相粒子，初生Al3Sc強(qiáng)化相粒子與熱處理過程中沉淀析出的大量更為細(xì)小的次生Al3Sc強(qiáng)化相粒子共同與位錯交互作用。當(dāng)合金線材采用T6(SCR成形、在線固溶并人工時效)熱處理制度時，320 ℃時效2 h后合金線材的抗拉強(qiáng)度為353 MPa；當(dāng)采用T8(SCR成形、在線固溶、冷拔加工并人工時效)熱處理制度時，合金材料的抗拉強(qiáng)度為378 MPa；當(dāng)采用T9(SCR成形、在線固溶、人工時效并冷拔加工)熱處理制度時，合金線材的抗拉強(qiáng)度為435 MPa。
關(guān)鍵字: Al-Mg-Sc合金；時效；單輥攪拌冷卻(SCR)；力學(xué)性能
mechanical properties of Al-Mg-Sc alloy wire formed by shearing-cooling-rolling technology
（1. School of Mechanical Engineering, Shenyang University, Shenyang 110044, China;
(2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract:Al-3Mg-0.5Sc alloys wires were prepared by shearing-cooling-rolling (SCR) and on-line solution, the effects of heat treatment on the microstructures and mechanical properties of those alloy wires formed by SCR were studied. The results show that primary Al3Sc and dislocation are formed in alloy wire by SCR deformation, and the finer secondary Al3Sc dispersoids precipitated from the supersaturated solution in the treatment can effectively pin dislocation. After T6(SCR forming, on-line solution, aging) treatment at 320 ℃ for 2 h, the tensile strength is 353 MPa. After T8(SCR forming, on-line solution, drawing, aging) treatment, the tensile strength is 378 MPa. After T9 (SCR forming, on-line solution, aging, drawing) treatment, the tensile strength is 435 MPa.
Key words: Al-Mg-Sc alloy; aging; shearing-cooling-rolling (SCR); mechanical property
