Effects of Rapid Infrared Heating and Cryogenic Cooling on the Tensile Properties and Fracture Behavior of Al-Cu-Mg

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-09-10 DOI:10.22068/IJMSE.2242

Mitra Ghannadi, Hediye Hosseini, B. Sadeghi, B. Mirzakhani, M. T. Honaramooz

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Abstract

The objective of this work was to investigate the effect of rapid heating and cryogenic cooling on the fracture and tensile properties of Al-Cu-Mg samples. The specimens were subjected to three different heat treatment cycles in which the Infrared heating (IR) were used as the heating medium at the ageing stage, and the liquid nitrogen and water were used as the quenching mediums. The ageing temperature and time were 1900C and from 2 to 10h respectively. The results indicated that by using IR at the ageing stage, the hardening rate enhanced because the rapid heating via this method led to faster diffusion of the alloying elements. Moreover, the high density of nanosized precipitates formed during ageing was another reason for higher strength and ductility. Cryogenic treatment had a negligible effect on both the microstructure and tensile properties. However there was an improvemnet in the ductility to some extent. Overall, the combination of a high heating rate and cryogenic treatment led to the highest mechanical properties. SEM micrographs of the fracture surface demonstrated that in Cryogenic treatment plus Artificial Ageing (CAA) condition, the surface was fully covered by deep dimples in contrast to the Cryogenic treatment plus Infrared Heating (CIR) and Water-Quench plus Infrared Heating (QIR) conditions which contained shallwer dimples. Some facets were also observed in the latter samples.

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快速红外加热和低温冷却对Al-Cu-Mg拉伸性能和断裂行为的影响

研究了快速加热和低温冷却对Al-Cu-Mg试样断裂和拉伸性能的影响。采用红外加热(IR)作为时效阶段的加热介质，液氮和水作为淬火介质，对试样进行了三种不同的热处理循环。老化温度为1900C，老化时间为2 ~ 10h。结果表明，在时效阶段使用红外光谱，由于快速加热导致合金元素扩散速度加快，从而提高了硬化速率。此外，在时效过程中形成的纳米级析出物的高密度是提高强度和延展性的另一个原因。低温处理对微观组织和拉伸性能的影响可以忽略不计。但在一定程度上提高了延展性。总的来说，高加热速率和低温处理的结合导致了最高的机械性能。断口表面的SEM显微图表明，低温加人工时效(CAA)条件下，断口表面完全被深韧窝覆盖，而低温加红外加热(CIR)和水淬加红外加热(QIR)条件下，断口表面含有较浅的韧窝。在后一种样品中也观察到一些切面。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.