铜含量对触变成形Al-Si-Cu-Mg合金显微组织与力学性能的影响（英文）

发布时间：2018-01-16 01:16

本文关键词：铜含量对触变成形Al-Si-Cu-Mg合金显微组织与力学性能的影响（英文）　出处：《Transactions of Nonferrous Metals Society of China》2015年11期 　论文类型：期刊论文

【摘要】：研究了铜含量对触变Al-6Si-xCu-0.3Mg(x=3,4,5,6,质量分数,%)合金显微组织与力学性能的影响。试样在液相分数为50%时进行触变成形,并对部分样品进行T6热处理。采用光学显微镜、扫描电子显微镜、能谱仪和X射线衍射、硬度和拉伸测试对样品进行表征。结果表明,冷却倾斜板铸造和触变成形工艺能促进铝基体中细小分散的金属间化合物的形成。与硬模铸造相比,合金的力学性能大幅度提高。随着铜含量的增加,触变成形合金的硬度和拉伸强度提高。热处理触变成形Al-6Si-3Cu-0.3Mg合金的抗拉强度、屈服强度和伸长率分别为298MPa、201 MPa和4.5%。而当铜含量增加至6%时,合金的抗拉强度、屈服强度和伸长率分别为361 MPa、274 MPa和1.1%。触变成形Al-6Si-3Cu-0.3Mg合金的失效形式为韧窝断裂,而当铜含量增加至6%时,失效形式为解理断裂。
[Abstract]:The effect of copper content on the thixotropic Al-6Si-xCu-0.3Mg3Mg3Mg-xCU _ 3O _ (3) and the mass fraction of Al-6Si-xCu _ (0.3) mg ~ (3 +. The effect of microstructure and mechanical properties on the microstructure and mechanical properties of the alloy. The specimen was thixotropic when the liquid fraction was 50, and some samples were treated by T6 heat treatment. Optical microscope and scanning electron microscope were used. The samples were characterized by energy spectrometer, X-ray diffraction, hardness and tensile test. Cooling inclined plate casting and thixoforming process can promote the formation of fine and dispersed intermetallic compounds in aluminum matrix. Compared with hard die casting, the mechanical properties of the alloy are greatly improved. With the increase of copper content, the mechanical properties of the alloy are greatly improved. The hardness and tensile strength of the thixotropic alloy were improved, and the tensile strength, yield strength and elongation of the heat-treated thixotropic Al-6Si-3Cu-0.3Mg alloy were 298MPa. The tensile strength, yield strength and elongation of the alloy were 361 MPa when the copper content increased to 6. The failure form of thixotropic Al-6Si-3Cu-0.3Mg alloy is dimple fracture and cleavage fracture when copper content is increased to 60.The failure mode of thixotropic Al-6Si-3Cu-0.3Mg alloy is dimple fracture.
【作者单位】： Department
【基金】：Universiti Teknikal Malaysia Melaka (UTeM) and the Ministry of Education Malaysia for financial support of this study Universiti Kebangsaan Malaysia (UKM) for the financial support under research grants GUP-2012-040 and AP-2012-014
【分类号】：TG146.21
【正文快照】： 1 IntroductionThixoforming is a type of semisolid metal(SSM)processing for forming alloys in the semisolid state tonear net-shaped products.Today,thixoforming hasbecome one of the important processing techniquesaccepted by many manufacturers,replacing co

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