Effects of quenching temperature on the structure, segregation, and properties of the AM4.5Kd + 0.2 wt.% La alloy after artificial aging

Author:

Slavinskaya N. A.1ORCID,Ri H.1ORCID,Ri E. H.1ORCID,Zhivetev A. S.1ORCID

Affiliation:

1. Pacific National University

Abstract

The identification of structural components in the AM4.5Kd + 0.2 wt.% La alloy, subjected to quenching at different temperatures (535–605 °C) and artificial aging at 155 °C for 4 h, was conducted through electron microscopy and XRD. An increase in the quenching temperature from 535 to 605 °C promotes the enlargement of structural components, including the α-solid solution, various aluminides, and eutectics. We observed that the base metal is not homogeneous in its chemical composition, consisting of two types of solid solutions: α1 and α2. The Cu and Mn solubility in the α2-solid solution is higher than in the α1-solid solution. As the quenching temperature increases to tq = 605 °C, the copper content in the α1-solid solution decreases. In contrast, the copper content in the α2-solid solution follows a curve with two maxima at 545 °С (4.5 at.%) and 585 °С (8.7 at.%). The Mn content in the α1-solid solution decreases sharply to the 545 °С quenching temperature and remains relatively constant up to tq = 605 °С (0.2 at.%). The Mn content in the α2-solid solution follows a curve with its maximum at tq = 545 °С (4.3 at.% Mn). Subsequent temperature rise results in a sharp drop in Mn content from 1.0 at.% at t = 565 °С to 0.3 at.% at 605 °С. Hence, the max solubility of Cu and Mn in the α2-solid solution occurs at 545 °C. At 585 °С, only an elevated Cu content (~8.7 at.%) was observed. Aluminides of alloying elements with different stoichiometries crystallize at different quenching temperatures, with complex AlxTiyLazCuvCdw and AlxCuyMnzCdv alloyed aluminides being most commonly found. ncreasing the quenching temperature to 535–545 °С results in higher hardness of the AM4.5Kd + 0.2 wt.% of La alloy, reaching 98–104 HB, with subsequent decrease to 60 HB as the quenching temperature reaches 605 °С. The hardness of the unhardened alloy is 60 HB. The optimal quenching temperature for the AM4.5Kd + 0.2 wt.% of La alloy is in the range of 535–545 °С. This temperature corresponds to the highest hardness of the alloy and the microhardness of the aluminide.

Publisher

National University of Science and Technology MISiS

Reference30 articles.

1. Ogorodov D.V., Trapeznikov A.V., Popov D.A., Pentyukhin S.I. Development of foundry aluminum alloys in VIAM (to the 120th anniversary of the birth of I.F. Kolobnev). Trudy VIAM. 2017;2(50):105—122. (In Russ.).

2. Belov N.A., Alabin A.N. Promising aluminum alloys with increased heat resistance for reinforcement engineering as a possible alternative to steels and cast iron. Armaturostroenie. 2010;2(65):50—54. (In Russ.).

3. Квасова Ф.И., Фридляндер И.Н. Промышленные алюминиевые сплавы. М.: Металлургия, 1984. 528 c.

4. Алиева С.Г., Альтман М.Б., Амбарцумян С.М. Промышленные алюминиевые сплавы. М.: Металлургия, 1984. 527 c.

5. Patel N., Joshi M., Singh A., Pradhan A.K. Effect of solution heat treatment on microstructure and some properties of Al—Cu—Mg alloy. Transactions of the Indian Institute of Metals. 2023;76(10):2681—2689. https://doi.org/10.1007/s12666-023-02961-x

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3