Creep and Mechanical Properties of a Commercial Aluminum Alloy Processed by ECAP

机译：ECAP处理的商用铝合金的蠕变和力学性能

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A commercial spray-cast aluminum alloy, having a composition of Al-11.5% Zn-2.5% Mg-0.9% Cu-0.2% Zr, was processed by equal-channel angular pressing (ECAP) to give an ultrafine-grained microstructure with a grain size of ～0.3 μm and a fracturing of the rod-shaped MgZn_2 precipitates. The mechanical properties of the alloy were investigated using microhardness testing at ambient temperature and tensile testing at a temperature of 673 K. In addition, creep tests were conducted using a double-shear testing facility at temperatures from 473 to 673 K. The results show the microhardness decreases with increasing numbers of passes in ECAP and high strain rate superplasticity is achieved after processing by ECAP at 473 K for 6 or 8 passes. A maximum elongation of > 1000% was recorded at a strain rate of 10~(-2) s~(-1) when testing at 673 K. The creep tests show the creep rates are faster in the as-pressed material than in the as-received material when testing at the same applied stress and testing temperature.

机译：通过等通道角挤压（ECAP）对成分为Al-11.5％Zn-2.5％Mg-0.9％Cu-0.2％Zr的商用喷铸铝合金进行处理，以得到具有超细晶粒的超细晶粒组织。晶粒尺寸〜0.3μm，且棒状MgZn_2破裂。使用环境温度下的显微硬度测试和673 K温度下的拉伸测试对合金的机械性能进行了研究。此外，使用双剪切测试设备在473至673 K的温度下进行了蠕变测试。随着ECAP道次的增加，显微硬度降低，并且在473 K下通过ECAP处理6道或8道次后获得了高应变速率超塑性。在673 K下测试时，在10〜（-2）s〜（-1）的应变速率下，记录的最大伸长率> 1000％。蠕变测试表明，压制成形材料的蠕变速率比在5％的材料中更快。在相同的施加应力和测试温度下进行测试时，所接收的材料为原始材料。

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来源
《International Conference on Nanomaterials by Severe Plastic Deformation(NanoSPD3); 20050922-26; Fukuoka(JP)》|2005年|P.77-82|共6页
会议地点 Fukuoka(JP)
作者
Cheng Xu; Terence G. Langdon;
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作者单位

Departments of Aerospace Mechanical Engineering and Materials Science University of Southern California, Los Angeles, CA 90089-1453, USA;

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会议组织
原文格式 PDF
正文语种 eng
中图分类塑料;
关键词
aluminum alloys; creep; equal-channel angular pressing; mechanical properties;

机译：铝合金;蠕变;等径角挤压;力学性能;

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4. Creep and Mechanical Properties of a Commercial Aluminum Alloy Processed by ECAP [C] . Cheng Xu, Terence G. Langdon International Conference on Nanomaterials by Severe Plastic Deformation(NanoSPD3) . 2006

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5. Processing and properties of mechanically alloyed metastable aluminum alloys. [D] . Desch, Paul Brian. 1996

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Creep and Mechanical Properties of a Commercial Aluminum Alloy Processed by ECAP

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