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:In paper, recycled Al-1.15Mg-1.02Si-0.7Cu alloy was optical prepared by meiting and casting, the microstructural evolution of the alloy were analyzed by using optical nicroscopy(OM), scanning e!ectron microscopy (SEM), e!ectron back scattered diffraciion(EBSD) and transmission e!ectron nicroscope(TEM),the effects of heal treatment on the mechanical and corrosionlresistant properties of the extruded proUes were invesiigated. The results show that the recrystaliization of the alloy was competed by soiid solution at 550C and fine equaaxaal crystass were obtanned. The iime required for the alloys to reach peak hardness under artificia1 aging cond!tions at 155,175 and 195 C was 18,8 and 4 h, respectively, and the peak hardnesses were 132.96 HV,132. 94 HV and 132.22 HV, respectively, wtth the extruded profiles obtanning the highest tensle strength of 410. 42 MPa and higher elongation of 14. 75% under aging cond!tions at 175 C/8 h. The optimizedsoid solution process ss 550 C/1 hand the artifidal aging process ss 175 C/8 h. The tendency of the alloy to intergranular corrosion ss more pronounced,and the alloy corrodes most severely under peakaged cond!tions, followed by over-aged and weakest underaged. [ABSTRACT FROM AUTHOR]

Atmtng at the problem that brittle Ti-Fe intermetalHc compounds are easily formed tn the additive manufacturing process of titanium/steel composites, which deteriorates the interface properties. In this paper, n^kel (ERN-1)was se!ected as the Interlayer,and the integrated preparation of TC4/309L composites was reaiized by laser fuse additive manufacturing technology. The effect of Ni interlayer addition on the rmcrostructure and properties of the interface was analyzed. The resuits show that "The interface of TC4/309L composites with Ni interlayer Is mainly composed of Fe/Ni interface and Ti/Ni interface. For the Fe/Ni interface,Fe and Ni form an infinite soiid solution, and no obvious defects such as cracks and pores are found, achieving a good metallurgical bonding. The Ti/Ni interface contains TiFe,TiNi3,TiNi,Ti2Ni and other brittle intermetalic compounds,and the maximum hardness of the interface reaches 670. 1 HV. The micro-area tensie test of the interface bondng strength shows that the bonding strength is 30. 5 MPa,and it breaks at the Ti/Ni Interface,showing brittie fracture characteristics. [ABSTRACT FROM AUTHOR]