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ECHE擠壓對(duì)AZ31鎂合金組織和性能的影響
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國(guó)家科技重大專項(xiàng)（2009ZX04005-031-11）；“111”引智計(jì)劃（B08040）


Effect of ECHE Forming on the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy
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    摘要:

    提出了等通道螺旋轉(zhuǎn)角擠壓(equal channel helix angular extrusion，ECHE)變形方法，采用Deform-3D平臺(tái)的有限元模擬、OM、SEM、TEM、拉伸試驗(yàn)等方法，研究了ECHE 制造AZ31鎂合金輕質(zhì)螺栓坯料的擠壓工藝、溫度場(chǎng)、合金流動(dòng)情況、組織和性能。結(jié)果表明：在變形溫度為380 ℃，擠壓速度為3 mm·s-1時(shí)，合金變形均勻，不易出現(xiàn)擠壓缺陷；等通道螺旋轉(zhuǎn)角擠壓變形可以顯著細(xì)化AZ31鎂合金晶粒；其擠壓過程中晶粒細(xì)化機(jī)制為晶粒破碎和動(dòng)態(tài)再結(jié)晶；擠壓后的平均晶粒尺寸為3~5 μm，且合金晶粒大小均勻；力學(xué)性能較鑄態(tài)大幅度提高，室溫抗拉強(qiáng)度和屈服強(qiáng)度分別由209和104 MPa提高到286和165 MPa，延伸率由11%提高到26.4%，拉伸斷口呈現(xiàn)為韌窩斷裂和準(zhǔn)解理斷裂的混合特征。

    Abstract:

    A deformation technique of the equal channel helix angular extrusion (ECHE) was proposed. Extrusion process, temperature field, metal flow, microstructure and mechanical properties of ECHE AZ31 magnesium alloy were investigated by Deform-3D FEM, OM, SEM, TEM and tensile experiments. The results show that metal flow is symmetrical and there is no disfigurement at the temperature of 380 oC and extrusion rate of 3 mm·s-1. The ECHE could evidently refine the grains of the alloy. The mechanism of grain refinement is grain fragmentation and dynamic recrystallization. The mean grain size after extrusion is 3~5 μm and the material is deformed homogeneously. The mechanical properties are greatly improved. The tensile strength, yield strength and elongation of the sample are increased from 209 MPa, 104 MPa and 11% to 286 MPa, 165 MPa and 26.4%, respectively. The tensile fracture combines the dimple fracture with quasi-cleavage fracture.

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石 磊,楊 合,郭良剛,黨 利,張保軍,鄭文達(dá),張 君. ECHE擠壓對(duì)AZ31鎂合金組織和性能的影響[J].稀有金屬材料與工程,2012,41(11):1955~1959.[Shi Lei, Yang He, Guo Lianggang, Dang Li, Zhang Baojun, Zheng Wenda, Zhang Jun. Effect of ECHE Forming on the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy[J]. Rare Metal Materials and Engineering,2012,41(11):1955~1959.]
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  • 收稿日期:2011-11-29
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