Effects of annular channel angular extrusion process and heat treatment on microstructure and mechanical properties of 2A12 aluminum alloy cabin

Microstructure evolution and mechanical properties of AZ80 Mg alloy during annular channel angular extrusion (350 °C) and heat treatment with varying parameters were investigated, respectively. The results showed that dynamic recrystallization of Mg grains was developed and the dendritic eutectic β-Mg17Al12 phases formed during the solidification were broken into small β-phase particles after hot extrusion. Moreover, a weak texture with two dominant peaks formed owing to the significant grain refinement and the enhanced activation of pyramidal <c + a> slip at relative high temperature. The tension tests showed that both the yield strength and ultimate tensile strength of the extruded alloy were dramatically improved owing to the joint strengthening effect of fine grain and β-phase particles as compared with the homogenized sample. The solution treatment achieved the good plasticity of the alloy resulting from the dissolution of β-phases and the development of more equiaxed grains, while the direct-aging process led to poor alloy elongation as a result of residual eutectic β-phases. After solution and aging treatment, simultaneous bonding strength and plasticity of the alloy were achieved, as a consequence of dissolution of coarse eutectic β-phases and heterogeneous precipitation of a large quantity of newly formed β-phases with both the morphologies of continuous and discontinuous precipitates.

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Effect of solid solution heat treatment following age hardening on microstructure and mechanical properties of 7000 series power aluminum alloy

Materials Research Express ◽

10.1088/2053-1591/ab6775 ◽

2020 ◽

Vol 6 (12) ◽

pp. 1265g4

Author(s):

Hao Chen ◽

Zhi Wang ◽

Xiaojing Xu ◽

Tabie Vitus ◽

Ze Jiang ◽

...

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Solid Solution ◽

Aluminum Alloy ◽

Solution Heat Treatment ◽

Age Hardening ◽

Microstructure And Mechanical Properties

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Effect of Trace Yttrium Addition and Heat Treatment on the Microstructure and Mechanical Properties of As-Cast ADC12 Aluminum Alloy

Applied Sciences ◽

10.3390/app9010053 ◽

2018 ◽

Vol 9 (1) ◽

pp. 53 ◽

Cited By ~ 1

Author(s):

Jianlong Liu ◽

Qingjie Wu ◽

Hong Yan ◽

Songgen Zhong ◽

Zhixiang Huang

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Aluminum Alloy ◽

Primary Si ◽

Microstructure And Mechanical Properties ◽

Yttrium Addition ◽

The Matrix ◽

The Mean ◽

Average Size ◽

Small Average Size

The effects of rare earth yttrium (Y) additions and the heat treatment process on the microstructure and mechanical properties of as-cast ADC12 aluminum alloy have been investigated. The results showed that the primary Si crystals were significantly refined from long axis to fibrous or granular when the Y content was 0.2 wt%. Compared to the matrix, the mean area and aspect ratio were decreased by 92% and 75%, respectively. Moreover, the Si and Fe-rich phases were spheroidized and refined with a small average size during the solid solution. It was also noted that the copper-rich phases were dissolved into the matrix. Correspondingly, it was found that after metamorphic and heat treatment the ultimate tensile strength (UTS), elongation, and, hardness increased by 81.9%, 69.7%, and 74.8%, respectively, compared to the matrix. The improved mechanical properties can primarily be attributed to the optimization of the microstructure and the refinement of various phases.

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