Achieving Twin Strengthening in Bulk Aluminum via Adding Nanoparticles Combined with Tailoring Hot Pressing Temperature

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-09-15 DOI:10.1007/s40195-024-01771-4

Ke Zhao, Zhongying Duan, Jinling Liu, Linan An

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Abstract

It is extremely difficult to strengthen bulk aluminum (Al) by twins, due to its high stacking fault energy under standard loading conditions. In this study, a simple yet effective solution was proposed for introducing twins to strengthen bulk Al. The method involves the addition of nanoparticles with high volume fraction combined with the tailoring of sintering temperature toward the melting point of Al during hot pressing. Sintering temperature plays an important role in forming twins in bulk Al containing high content nanoparticles. The twin content increases with increasing sintering temperature in the range of 590–640 °C. At sintering temperature of 640 °C, the twin content reaches 17%, enabling the significant improvement in the yield strength of the bulk Al from 251 to 400 MPa, compared with the sample with few or no twins. The twin strengthening may serve as a major strengthening mechanism for bulk Al, and its strengthening contribution is comparable to the dominant Orowan strengthening resulting from the added nanoparticles.

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通过添加纳米颗粒和调整热压温度实现散装铝的双倍强度

在标准加载条件下，散装铝（Al）的堆积断层能量很高，因此用孪晶来强化散装铝非常困难。本研究提出了一种简单而有效的解决方案，通过引入孪晶来强化铝块。该方法包括添加高体积分数的纳米颗粒，并在热压过程中将烧结温度调整到铝的熔点。烧结温度在含有高含量纳米粒子的块状铝中形成孪晶方面起着重要作用。在 590-640 °C 的烧结温度范围内，孪晶含量随着烧结温度的升高而增加。烧结温度为 640 ℃ 时，孪晶含量达到 17%，与孪晶很少或没有孪晶的样品相比，块状铝的屈服强度从 251 MPa 显著提高到 400 MPa。孪晶强化可能是块状铝的一种主要强化机制，其强化贡献与添加纳米粒子产生的主要奥罗旺强化相当。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.