Anomalous temperature-dependent strength of copper alloy manufactured by laser-beam powder bed fusion

IF 4.2 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters Pub Date : 2024-08-24 DOI:10.1016/j.addlet.2024.100236

Dasom Kim , Naoki Takata , Junji Umeda , Toshihiko Shimizu , Makoto Kobashi

{"title":"Anomalous temperature-dependent strength of copper alloy manufactured by laser-beam powder bed fusion","authors":"Dasom Kim , Naoki Takata , Junji Umeda , Toshihiko Shimizu , Makoto Kobashi","doi":"10.1016/j.addlet.2024.100236","DOIUrl":null,"url":null,"abstract":"<div><p>This study reports an anomalous temperature-dependent tensile behavior of laser-beam powder bed fusion (PBF-LB) processed Cu–Cr–Zr alloy. The yield strength of the alloy initially decreases as the temperature increases to 200±5 MPa and then increases to 350±11 MPa at 500°C before reducing to 234±6 MPa at 600°C. The microstructure consists of elongated Cu grains with a high concentration of Cr solute (∼1 mass%), resulting from rapid solidification during the PBF-LB process. Transmission electron microscopy for the specimens deformed at 500°C revealed the presence of numerous nanoscale Cr-rich particles embedded inside the supersaturated solid solution of the Cu matrix. Nanoscale particles can act as barriers to dislocation motion, leading to an increase in internal stress during plastic deformation at elevated temperatures. This work provides the high potential of post heat treatments for achieving superior mechanical performance using high solute supersaturation formed by the PBF-LB process.</p></div>","PeriodicalId":72068,"journal":{"name":"Additive manufacturing letters","volume":"11 ","pages":"Article 100236"},"PeriodicalIF":4.2000,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772369024000446/pdfft?md5=df4647e286e5713b4077aa24a5b81b74&pid=1-s2.0-S2772369024000446-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Additive manufacturing letters","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772369024000446","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MANUFACTURING","Score":null,"Total":0}

引用次数: 0

Abstract

This study reports an anomalous temperature-dependent tensile behavior of laser-beam powder bed fusion (PBF-LB) processed Cu–Cr–Zr alloy. The yield strength of the alloy initially decreases as the temperature increases to 200±5 MPa and then increases to 350±11 MPa at 500°C before reducing to 234±6 MPa at 600°C. The microstructure consists of elongated Cu grains with a high concentration of Cr solute (∼1 mass%), resulting from rapid solidification during the PBF-LB process. Transmission electron microscopy for the specimens deformed at 500°C revealed the presence of numerous nanoscale Cr-rich particles embedded inside the supersaturated solid solution of the Cu matrix. Nanoscale particles can act as barriers to dislocation motion, leading to an increase in internal stress during plastic deformation at elevated temperatures. This work provides the high potential of post heat treatments for achieving superior mechanical performance using high solute supersaturation formed by the PBF-LB process.

查看原文本刊更多论文

用激光束粉末床熔合技术制造的铜合金强度随温度变化的异常现象

本研究报告了激光束粉末床熔化（PBF-LB）加工的 Cu-Cr-Zr 合金随温度变化的异常拉伸行为。合金的屈服强度最初随着温度的升高而降低，为 200±5 MPa，然后在 500°C 时升至 350±11 MPa，在 600°C 时降至 234±6 MPa。微观结构由细长的铜晶粒组成，其中含有高浓度的铬溶质（∼1 质量%），这是在 PBF-LB 过程中快速凝固的结果。对在 500°C 下变形的试样进行透射电子显微镜观察后发现，在铜基体的过饱和固溶体中嵌入了大量富含铬的纳米级颗粒。纳米级颗粒可作为位错运动的障碍，导致高温塑性变形过程中内应力的增加。这项工作提供了后热处理的巨大潜力，可利用 PBF-LB 工艺形成的高溶质过饱和度实现优异的机械性能。

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