(1. 湖南大學(xué) 汽車車身先進(jìn)設(shè)計(jì)與制造國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410082；
2. 湖南大學(xué) 機(jī)械與運(yùn)載工程學(xué)院，長(zhǎng)沙 410082)
摘 要: 采用壓鑄制備薄壁AlSi10MnMg鋁合金鑄件，用金相技術(shù)、密度、拉伸性能等分析方法討論澆注溫度對(duì)薄壁鋁合金壓鑄充型沿程的組織與力學(xué)性能的影響。結(jié)果表明：隨著澆注溫度的升高，試樣流動(dòng)臨界長(zhǎng)度增加，氣孔增多，α(Al)枝晶變細(xì)，抗拉強(qiáng)度和斷后伸長(zhǎng)率先增加后降低。隨著充型沿程流動(dòng)長(zhǎng)度的增加，氣孔先減少后增加，α(Al)枝晶變化不大。當(dāng)澆注溫度為650和680 ℃時(shí)，試樣抗拉強(qiáng)度和斷后伸長(zhǎng)率沿充型流動(dòng)長(zhǎng)度的增加而減小；當(dāng)澆注溫度為710和740 ℃時(shí)，試樣抗拉強(qiáng)度和斷后伸長(zhǎng)率沿充型流動(dòng)長(zhǎng)度的增加變化較小。
關(guān)鍵字: 薄壁鋁合金；壓鑄；組織；力學(xué)性能
（1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University,
Changsha 410082, China;
2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China）
Abstract:The thin-wall AlSi10MnMg aluminum alloy samples were prepared by high pressure die casting. The effects of pouring temperature on the microstructure and mechanical properties along the fluidity length were discussed by metallographic techniques, density measurement and tensile tests. The results show that, with the pouring temperature increasing, the critical fluidity length and porosity increase, and α(Al) grain size decreases and the ultimate tensile strength and elongation to fracture increase firstly, and then decrease. With the increase of the fluidity length, the porosity decreases firstly and then increases, but the α(Al) grain size is insignificant. The ultimate tensile strength and elongation to fracture decrease along the fluidity length under pouring temperatures of 650 and 680 ℃. However, the difference of the ultimate tensile strength and elongation to fracture along the fluidity length under pouring temperatures of 710 and 740 ℃ is insignificant.
Key words: thin-wall aluminum alloy; high pressure die casting; microstructure; mechanical properties
