Structural and Fractographic Analysis of Aluminum Alloy before and After Fatigue Loading

IF 1.6 Q4 ENGINEERING, MANUFACTURING

Manufacturing Technology Pub Date : 2023-09-14 DOI:10.21062/mft.2023.067

Milan Uhríčik, Peter Palček, Mária Chalupová, Lenka Kuchariková, Lucia Pastierovičová, Denisa Medvecká, Lenka Markovičová, Róbert Balšianka, Alan Vaško

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Abstract

The article deals with the analysis of the structure and fracture surface of aluminum alloy samples. Alu-minum alloy AlMg9 was used as an experimental material. The material from which the samples were made was supplied as cast without heat treatment, and specifically the material was produced by the continuous casting method. The structure of the test material was examined using a Neophot 32 optical microscope, and the fracture surface of the test sample was examined using a scanning electron microscope (SEM). The fatigue life of the aluminum alloy was tested by three-point bending cyclic loading using the parameters - frequency f = 100 Hz, temperature T = 22 ± 5 ℃ and stress ratio R = 0.11. The analysis showed that cast aluminum alloys are very sensitive to casting defects, such as porosity or the content and distribution of intermetallic phases. If large pores or phases are present on or near the surface of the sample, this can be the dominant cause of fatigue crack initiation and reduction of the fatigue lifetime.

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铝合金疲劳加载前后的组织与断口分析

本文对铝合金试样的组织和断口进行了分析。采用铝合金AlMg9作为实验材料。制作样品的材料是未经热处理的铸件，具体来说，材料是通过连续铸造方法生产的。用Neophot 32光学显微镜对测试材料的结构进行了检测，用扫描电子显微镜(SEM)对测试样品的断口表面进行了检测。采用三点弯曲循环加载方法，频率f = 100 Hz，温度T = 22±5℃，应力比R = 0.11，对铝合金的疲劳寿命进行了试验研究。分析表明，铸铝合金对铸造缺陷非常敏感，如气孔率或金属间相的含量和分布。如果试样表面或表面附近存在较大的孔隙或相，这可能是疲劳裂纹萌生和疲劳寿命缩短的主要原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Manufacturing Technology Engineering-Industrial and Manufacturing Engineering

CiteScore

2.10

自引率

44.40%

发文量