(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 武漢職業(yè)技術(shù)學(xué)院 輕工學(xué)院，武漢 430074)
摘 要: 采用活性熔劑保護(hù)熔煉、水冷銅模激冷鑄造制備Al-5.8Mg-0.4Mn和Al-5.8Mg-0.4Mn- 0.25Sc-0.1Zr(質(zhì)量分?jǐn)?shù)，%)兩種合金鑄錠。合金鑄錠經(jīng)熱軋−中間退火−冷軋成2 mm薄板；研究穩(wěn)定化退火及微量Sc和Zr對Al-Mg-Mn合金組織與性能的影響。結(jié)果表明：在Al-Mg-Mn合金中加入微量Sc和Zr后形成大量彌散的 Al3(Sc, Zr)粒子，這些粒子對位錯(cuò)和亞晶界具有強(qiáng)烈的釘扎作用，能明顯提高合金的抗再結(jié)晶能力和室溫力學(xué)性能；Al-Mg-Mn-Sc-Zr合金板材經(jīng)300 ℃退火1 h后可獲得最佳綜合力學(xué)性能，其σb、σ0.2 與δ分別為436 MPa、327 MPa和16.7%。
關(guān)鍵字: Al-Mg-Mn-Sc-Zr合金；穩(wěn)定化退火；再結(jié)晶；Al3(Sc, Zr)粒子；顯微組織
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Institude of Light Industry, Wuhan Polytechnic College, Wuhan 430074, China）
Abstract:Both Al-5.8Mg-0.4Mn and Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr (mass fraction, %) alloy ingots were prepared using water chilling copper mould ingot metallurgy processing protected by active flux. The alloy ingots were finally rolled into 2 mm-thick sheets after hot rolling-intermediate annealing-cold rolling. The effects of stabilizing annealing and minor Sc, Zr on the microstructure and mechanical properties of Al-Mg-Mn alloys were studied. The results show that after adding minor Sc and Zr into Al-Mg-Mn alloy simultaneously a large number of Al3(Sc, Zr) particles dispersedly distribute in the matrix, which have function of strongly pinning sub-grain boundaries and dislocations. The anti-recrystallization ability and the mechanical properties of the Al-Mg-Mn-Sc-Zr alloy sheet are significantly improved. By annealing at 300 ℃ for 1 h, the Al-Mg-Mn-Sc-Zr alloy sheet can obtain the optimum application values of σb, σ0.2 and δ, which are 436 MPa, 327 MPa and 16.7%, respectively.
Key words: Al-Mg-Mn-Sc-Zr alloys; stabilizing annealing; recrystallization; Al3(Sc, Zr) particles; microstructure
