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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of Zr on the high cycle fatigue and mechanical properties of Al-Si-Cu-Mg alloys at elevated temperatures
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Effect of Zr on the high cycle fatigue and mechanical properties of Al-Si-Cu-Mg alloys at elevated temperatures

机译：Zr对高温升温高温合金高循环疲劳和力学性能的影响

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摘要

The Zr-modified Al-Si-Cu-Mg alloy with 0.14 wt%Zr addition was studied against the counterparts of commercially used EN-AC-42000 (Al7Si0.5Cu) baseline alloy for the effect of Zr on the high cycle fatigue (HCF) and mechanical properties at elevated temperatures of 150, 200, 250 degrees C. It was found that the fatigue life was significantly improved by 8-10 times at the high stress amplitude of 140 MPa in the Zr-modified alloy at all different temperatures. The fatigue strength coefficient, sigma(f)', of the baseline alloy was 574.9, 589.8, and 514.8 MPa at 150, 200, and 250 degrees C, respectively, which was greatly increased to 1412.3, 620.1, and 821.6 MPa for the Zr-modified alloy. The tensile strength was considerably improved by 34%-50%, dependant on the testing temperatures. The improved fatigue and tensile properties in the Zr-modified alloy could be mainly ascribed to: (1) the refined microstructure, with alpha-Al grain size decreasing from 335 to 253 mm and the secondary dendrite arm spacing (SDAS) dropping from 39 to 28 mm; (2) the reduced porosity; and (3) the additional precipitates strengthening effect by the nano-sized Al-Si-Zr-Ti dispersoids. (C) 2019 Elsevier B.V. All rights reserved.
机译：研究了0.14wt％Zr加入的Zr改性的Al-Si-Cu-Mg合金，用于对商业使用的ZH-AC-42000（AL7SI0.5CU）基线合金的对应部分进行ZR对高循环疲劳的影响（HCF ）在150,200℃的升高温度下，在Zr改性合金的高应力幅度下，抗疲劳寿命在所有不同温度下的高应力幅度为140MPa的高应力幅度显着提高了8-10倍的机械性能。基线合金的疲劳强度系数Sigma（F）'分别为574.9,589.8和514.8MPa，分别为50,250℃，Zr的大大增加至1412.3,620.1和821.6MPa制剂合金。抗拉强度显着提高了34％-50％，取决于测试温度。 ZR改性合金中的改善和拉伸性能可以主要归因于：（1）精制的微观结构，α-Al晶粒尺寸从335〜253mm减小，二次树枝状臂间距（SDAs）从39滴到39 28毫米; （2）降低孔隙度; （3）额外的沉淀物通过纳米型Al-Si-Zr-Ti分散体的强化效果。 （c）2019 Elsevier B.v.保留所有权利。

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