Effect of equal-channel angular extrusion on the mechanical and tribological properties of as-cast Zn-40Al-2Cu-2Si alloy

G. Purcek; O. Saray; T. Kucukomeroglu; M. Haouaoui; I. Karaman

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Effect of equal-channel angular extrusion on the mechanical and tribological properties of as-cast Zn-40Al-2Cu-2Si alloy

机译：等径角挤压对铸态Zn-40Al-2Cu-2Si合金力学和摩擦学性能的影响

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As-cast Zn-40Al-2Cu-2Si alloy was processed using equal-channel angular extrusion/pressing (ECAE/P) at 230 ℃ for four passes following route-B_C. After processing, the room temperature mechanical properties (strength, ductility and impact toughness) and dry sliding wear and friction characteristics of the alloy were investigated. After four-pass ECAE, the tensile elongation to fracture of the alloy increased from 0.8% to 14.4% without a considerable decrease in its strength values. The impact toughness also increased and the as-cast brittle alloy was transformed into a ductile and tougher alloy after processing. Such enhancements are attributed to the breakage of large dendrites and fragmentation of copper-rich-phase and Si particles into finer structures, and deformation-induced homogenization of the microstructure during multi-pass ECAE. Wear resistance of ECAE-processed Zn-40Al-2Cu-2Si alloy was notably improved especially at longer sliding distances and under higher applied pressures compared to the as-cast alloy. It was also found that the ECAE processing decreased the friction coefficient of the alloy.

机译：沿路线B_C，采用等通道角挤压/压制（ECAE / P）在230℃下对铸态Zn-40Al-2Cu-2Si合金进行了四道加工。加工后，研究了合金的室温机械性能（强度，延展性和冲击韧性）以及干滑动磨损和摩擦特性。经过四遍ECAE，合金的断裂拉伸伸长率从0.8％增加到14.4％，而强度值却没有明显降低。冲击韧性也增加，加工后的铸态脆性合金转变为韧性和韧性更高的合金。此类增强归因于大树枝状晶体的断裂以及富铜相和Si颗粒破碎成更细的结构，以及在多次通过ECAE期间变形诱导的微观结构均质化。与铸态合金相比，经ECAE处理的Zn-40Al-2Cu-2Si合金的耐磨性得到了显着改善，尤其是在更长的滑动距离和更高的施加压力下。还发现ECAE处理降低了合金的摩擦系数。

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来源
《Materials Science and Engineering》 |2010年第15期|p.3480-3488|共9页
作者
G. Purcek; O. Saray; T. Kucukomeroglu; M. Haouaoui; I. Karaman;
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作者单位

Department of Mechanical Eng., Karadeniz Technical University, 61080 Trabzon, Turkey;

Department of Mechanical Eng., Karadeniz Technical University, 61080 Trabzon, Turkey;

Department of Mechanical Eng., Karadeniz Technical University, 61080 Trabzon, Turkey;

Department of Mechanical Eng., Texas A&M University, College Station, TX 77843-3123, USA;

Department of Mechanical Eng., Texas A&M University, College Station, TX 77843-3123, USA;

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正文语种 eng
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关键词
zinc-aluminum alloys; equal-channel angular pressing; mechanical behavior; friction; wear;

机译：锌铝合金等通道角压机械性能摩擦;穿;

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Effect of equal-channel angular extrusion on the mechanical and tribological properties of as-cast Zn-40Al-2Cu-2Si alloy

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