MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Grain Refinement of Aluminum Alloy Bar by a Modified RAP Process for Semi-Solid Forming
Yongfei WangShengdun ZhaoChenyang Zhang
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2017 Volume 58 Issue 2 Pages 176-181

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Abstract

A modified Recrystallization and Partial Melting (RAP) process including Radial Forging (RF) and Semi-Solid Isothermal Treatment (SSIT) was proposed to refine the grains of 6063 Al alloy bar for semi-solid forming. The 6063 Al alloy bar (φ120 mm × 800 mm) was deformed by RF into a stepped shaft with different Area Reduction Ratios (ARRs) at the temperature of 300℃, and then the samples cut from both the central and peripheral parts of the RF-deformed bar were treated with SSIT at 630℃ for 10 min. The effect of ARR on the microstructural evolution of semi-solid 6063 Al alloy was investigated. Results showed that, during the RF process, the microstructures of the samples became denser as the ARR increased. After SSIT, with the increase of ARR, the average grain sizes of both the central and peripheral parts were reduced and the spheroidization degrees of both the central and peripheral parts were improved. The variation tendency of grain size experienced three different stages: precipitous reduction, gentle reduction and unobvious change. Besides, the differences between grain sizes of the peripheral and central parts were gradually decreased with the increase of ARR. Additionally, the optimal process parameter for refining grains was 70% ARR at 630℃ for 10 min.

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© 2016 The Japan Institute of Metals and Materials
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