本文選題：Al-Si-Cu合金　切入點：鎂　出處：《Transactions of Nonferrous Metals Society of China》2017年07期 　論文類型：期刊論文

【摘要】：采用傳統(tǒng)鑄造工藝制備了一系列Al-6Si-3Cu-(0.3-2)Mg合金。采用傾斜冷卻法制備原料,然后在液相分數(shù)為50%時進行觸變成形。研究鎂含量對鑄態(tài)和半固態(tài)條件下Al-Si-Cu合金顯微組織的的影響。研究結(jié)果表明,在Al-Si-Cu合金中添加鎂,形成Al_5Cu_2Mg_3Si_5和Mg_2Si相,消耗了部分Al_2Cu相和Si。添加Mg后,針狀β-Al_5FeSi相轉(zhuǎn)變成漢字狀的π-Al8Mg3Fe Si6相。對于鑄態(tài)合金,初生α(Al)為樹枝晶,隨著Mg含量的增加,樹枝晶逐漸減少。此外,鎂的添加可明顯減小α(Al)晶粒,但對硅的形貌無明顯影響。對于觸變成形合金,合金的顯微組織為細小的球狀初生相,且均勻分布硅和碎片狀的金屬間化合物。共晶硅由薄片狀和針狀轉(zhuǎn)變成細小纖維狀粒子。鎂對半固態(tài)加工合金的共晶硅作用明顯。Mg_2Si初生粒子由多邊形粒子轉(zhuǎn)變成細小球狀粒子,而漢字狀π-Al_8Mg_3FeSi_6轉(zhuǎn)變成緊湊結(jié)構(gòu)。隨著A319合金中Mg含量的增加,觸變成形合金的硬度、屈服強度和抗拉強度均增加,而伸長率降低。
[Abstract]:A series of Al-6Si-3Cu- were prepared by conventional casting process (0.3-2) Mg alloy prepared by slope cooling method. The raw materials, and then the liquid fraction is 50% for thixoforming. Effect of magnesium content on as cast and semi-solid conditions, the microstructure of Al-Si-Cu alloy. The results showed that adding magnesium in Al-Si-Cu alloy the formation of Al_5Cu_2Mg_3Si_5, and Mg_2Si, Al_2Cu and Si. partly consumed after adding Mg acicular beta -Al_5FeSi phase transformed into Chinese characters like pi -Al8Mg3Fe Si6. For as cast alloy, primary alpha (Al) dendrite structure, with the increase of Mg content, the dendrite gradually reduced. In addition, Mg Addition could significantly decreased alpha (Al) grain, but had no obvious effect on the morphology of silicon. The thixoformed alloy, the microstructure of the alloy is fine spherical primary phase, and uniform distribution of silicon and fragmented intermetallic compounds. The eutectic silicon from flake and acicular Change into fine fibrous particles. The eutectic silicon was.Mg_2Si primary particles of magnesium alloy semi-solid processing is changed from polygonal particles into fine small spherical particles, and the shape change Chinese characters PI -Al_8Mg_3FeSi_6 into compact structure. With the increase of Mg content in A319 alloy, thixoforming alloy hardness, yield strength and tensile strength were increase, but the elongation decreased.

【作者單位】： Department
【分類號】：TG292

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