Significant Increase in Strength and Elongation of Al-3.7 Cu-1Mg Alloy Via Short Age Treatment Cycle

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-09-10 DOI:10.22068/IJMSE.17.3.30

B. Mirzakhani, Y. Payandeh, H. Talebi, M. Maleki

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引用次数: 1

Abstract

In this paper, the effect of two-step precipitation hardening on the mechanical properties of Al-3.7Cu-1Mg was investigated. For this meaning, some specimens were subjected to the first step aging at 175, 190 and 205 °C for 2 h, once the samples solution treated at 500 °C. To have stable precipitates uniformly distributed in the microstructure and to reduce the heat treatment time, the second step was implied at 65 °C. The tensile and hardness tests were performed at ambient temperature immediately after aging. The results indicated that depending on the first step temperature, the second aging time affects the mechanical behavior of the alloy in different aspects. A factor named SNMP introduced to determine the cycle giving the best mechanical properties. The strength and elongation increase 1.5 and 2 times, respectively; compared to the values reported in the DIN EN 755-2 standard by performing the two-step aging cycle, consisting of the first-stage at 175 °C and the second step at 65 °C for 10 hours. Moreover, using the proposed two-step aging, the heat treatment time was reduced considerably compared to the conventional precipitation-hardening process.

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短时效处理显著提高Al-3.7Cu-1Mg合金的强度和伸长率

研究了两步沉淀硬化对Al-3.7Cu-1Mg合金力学性能的影响。为此，一些样品在175、190和205℃下进行第一步时效2小时，然后在500℃下进行固溶处理。为使析出相在组织中均匀稳定分布，缩短热处理时间，在65℃下进行第二步。时效后立即在常温下进行拉伸和硬度试验。结果表明，根据第一步时效温度的不同，第二次时效时间对合金的力学行为有不同的影响。引入一个名为SNMP的因素来确定产生最佳机械性能的循环。强度和伸长率分别提高1.5倍和2倍;与DIN EN 755-2标准中报告的值进行比较，通过执行两步老化循环，包括第一步在175°C下，第二步在65°C下持续10小时。此外，与传统的沉淀硬化工艺相比，采用所提出的两步时效，热处理时间大大缩短。

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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.