Two-stage aging treatment to accelerate aging kinetics without impairing strength in B4C/7A04Al composite

IF 4.4 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Science China Technological Sciences Pub Date : 2024-07-22 DOI:10.1007/s11431-024-2658-y

YunTao Chen, GuoNan Ma, ShiZe Zhu, Dong Wang, BoLv Xiao, ZongYi Ma

{"title":"Two-stage aging treatment to accelerate aging kinetics without impairing strength in B4C/7A04Al composite","authors":"YunTao Chen, GuoNan Ma, ShiZe Zhu, Dong Wang, BoLv Xiao, ZongYi Ma","doi":"10.1007/s11431-024-2658-y","DOIUrl":null,"url":null,"abstract":"Aging treatments are the key process to obtain satisfactory strength for 7xxxAl alloys and their composites. However, traditional single-stage (SS) aging is time-consuming to reach a peak strength condition. In this study, an efficient 120°C + 160°C two-stage (TS) aging treatment was proposed on a B4C/7A04Al composite fabricated via powder metallurgy (PM) technology, which could acquire similar peak-aging strength but only took about 15% of the time compared to traditional 120°C SS aging. The evolution of precipitation during the TS aging was investigated, as well as those of the 7A04Al alloys for comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of η′ phases inside the grains and thus increased the density of precipitates. Moreover, the short aging time limited the coarsening of precipitates and the broadening of precipitate-free zones. The above factors were beneficial for quickly obtaining satisfactory precipitation strengthening effects. The B4C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption by the chemical reaction between B impurities introduced by B4C particles and the Al matrix was considered to potentially retard the aging kinetics of the B4C/7A04Al composite. Nevertheless, the precipitation sequence was not affected.","PeriodicalId":21612,"journal":{"name":"Science China Technological Sciences","volume":"21 1","pages":""},"PeriodicalIF":4.4000,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science China Technological Sciences","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s11431-024-2658-y","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Aging treatments are the key process to obtain satisfactory strength for 7xxxAl alloys and their composites. However, traditional single-stage (SS) aging is time-consuming to reach a peak strength condition. In this study, an efficient 120°C + 160°C two-stage (TS) aging treatment was proposed on a B₄C/7A04Al composite fabricated via powder metallurgy (PM) technology, which could acquire similar peak-aging strength but only took about 15% of the time compared to traditional 120°C SS aging. The evolution of precipitation during the TS aging was investigated, as well as those of the 7A04Al alloys for comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of η′ phases inside the grains and thus increased the density of precipitates. Moreover, the short aging time limited the coarsening of precipitates and the broadening of precipitate-free zones. The above factors were beneficial for quickly obtaining satisfactory precipitation strengthening effects. The B₄C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption by the chemical reaction between B impurities introduced by B₄C particles and the Al matrix was considered to potentially retard the aging kinetics of the B₄C/7A04Al composite. Nevertheless, the precipitation sequence was not affected.

查看原文本刊更多论文

两阶段老化处理加速 B4C/7A04Al 复合材料的老化动力学而不影响强度

时效处理是 7xxxAl 合金及其复合材料获得满意强度的关键过程。然而，传统的单级（SS）时效处理需要耗费大量时间才能达到峰值强度。在本研究中，针对通过粉末冶金（PM）技术制造的 B4C/7A04Al 复合材料，提出了一种高效的 120°C + 160°C 两阶段（TS）时效处理方法，与传统的 120°C SS 时效相比，该方法可获得相似的峰值时效强度，但耗时仅为传统方法的 15%。研究了 TS 时效过程中析出物的演变，并与 7A04Al 合金的析出物进行了对比。在第二阶段时效过程中，较高的时效温度加速了晶粒内部η′相的成核，从而增加了析出物的密度。此外，较短的老化时间限制了析出物的粗化和无沉淀区的扩大。上述因素有利于快速获得令人满意的沉淀强化效果。在 TS 时效中，B4C/7A04Al 复合材料的时效动力学慢于 7A04Al 合金。B4C 颗粒引入的 B 杂质与铝基体之间的化学反应所消耗的镁元素被认为可能会延缓 B4C/7A04Al 复合材料的时效动力学。尽管如此，析出顺序并未受到影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Science China Technological Sciences ENGINEERING, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.40

自引率

10.90%

发文量

4380

审稿时长

3.3 months

期刊介绍： Science China Technological Sciences, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Technological Sciences is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of technological sciences. Brief reports present short reports in a timely manner of the latest important results.