不同镁含量Al-Si-Cu合金半固态加工的组织演变（英文）

发布时间：2018-03-22 19:48

本文选题：Al-Si-Cu合金　切入点：镁　出处：《Transactions of Nonferrous Metals Society of China》2017年07期 　论文类型：期刊论文

【摘要】：采用传统铸造工艺制备了一系列Al-6Si-3Cu-(0.3-2)Mg合金。采用倾斜冷却法制备原料,然后在液相分数为50%时进行触变成形。研究镁含量对铸态和半固态条件下Al-Si-Cu合金显微组织的的影响。研究结果表明,在Al-Si-Cu合金中添加镁,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,针状β-Al_5FeSi相转变成汉字状的π-Al8Mg3Fe Si6相。对于铸态合金,初生α(Al)为树枝晶,随着Mg含量的增加,树枝晶逐渐减少。此外,镁的添加可明显减小α(Al)晶粒,但对硅的形貌无明显影响。对于触变成形合金,合金的显微组织为细小的球状初生相,且均匀分布硅和碎片状的金属间化合物。共晶硅由薄片状和针状转变成细小纤维状粒子。镁对半固态加工合金的共晶硅作用明显。Mg_2Si初生粒子由多边形粒子转变成细小球状粒子,而汉字状π-Al_8Mg_3FeSi_6转变成紧凑结构。随着A319合金中Mg含量的增加,触变成形合金的硬度、屈服强度和抗拉强度均增加,而伸长率降低。
[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.

【作者单位】： Department
【分类号】：TG292

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