High-pressure torsion for fabrication of high-strength and high-electrical conductivity Al micro-wires
High-pressure torsion for fabrication of high-strength and high-electrical conductivity Al micro-wires
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DOI：
10.1007/s10853-014-8240-1
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发表时间：
2014-10-01
影响因子：
4.5
通讯作者：
Horita, Zenji
中科院分区：
文献类型：
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作者：
Cubero-Sesin, Jorge M.;In, Hiroyuki;Horita, Zenji
铁（Fe）通常存在于铝（Al）中，但其含量通常保持尽可能低，因为金属间相的形成可能会诱发断裂。在这项研究中，高压扭转（HPT）是用来控制在Al-2%Fe合金的微观组织与拉丝和时效处理，以提高不仅是他们的机械性能，而且还导电性。结果表明，环形样品的HPT处理产生的超细晶粒的尺寸类似于150 nm的基体中，而金属间相被破碎到纳米尺寸与一些Fe分数溶解在基体中。从HPT处理的样品中提取半环，并锻造成直径为0.4 mm的圆形截面。经HPT处理的样品成功地拉伸至0.08 mm的最终直径（25：1比率，96%面积减小），而未经HPT处理的样品在拉伸至0.117 mm直径（12：1比率，91%面积减小）后失效。通过在拉伸后老化1小时，HPT处理的环中的电导率增加到类似于65 IACS %，并且丝中的电导率增加到类似于54 IACS %。
Iron (Fe) is commonly found in aluminum (Al), but its contents are usually kept as low as possible, because the formation of intermetallic phases may induce fracture. In this study, high-pressure torsion (HPT) was used to control the microstructure in an Al-2 %Fe alloy in conjunction with wire drawing and an aging treatment, in order to improve not only their mechanical properties but also the electrical conductivity. It is shown that HPT processing of ring-shaped samples produced ultrafine grains with a size of similar to 150 nm in the matrix, while intermetallic phases were fragmented to nanosizes with some Fe fraction dissolved in the matrix. Semi-rings were extracted from the HPT-processed samples and swaged to a round section with 0.4-mm diameter. The HPT-processed sample was successfully drawn to a final diameter of 0.08 mm (25:1 ratio, 96 % reduction in area), whereas the sample without HPT processing failed after drawing to 0.117-mm diameter (12:1 ratio, 91 % reduction in area). The electrical conductivity increased to similar to 65 IACS % in the HPT-processed rings and to similar to 54 IACS % in the wires by aging for 1 h after the drawing.