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Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca
Hot tearing is the most common and serious casting defect that restricts the light weight and integration of magnesium alloy components. In the present study, trace Ca (0–1.0 wt.%) was added to improve the resistance of AZ91 alloy to hot tearing. The hot tearing susceptivity (HTS) of alloys was expe...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10220820/ https://www.ncbi.nlm.nih.gov/pubmed/37241513 http://dx.doi.org/10.3390/ma16103886 |
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author | Xiang, Hongchen Liu, Wenjun Wang, Qiang Jiang, Bin Song, Jiangfeng Wu, Hang Feng, Nan Chai, Linjiang |
author_facet | Xiang, Hongchen Liu, Wenjun Wang, Qiang Jiang, Bin Song, Jiangfeng Wu, Hang Feng, Nan Chai, Linjiang |
author_sort | Xiang, Hongchen |
collection | PubMed |
description | Hot tearing is the most common and serious casting defect that restricts the light weight and integration of magnesium alloy components. In the present study, trace Ca (0–1.0 wt.%) was added to improve the resistance of AZ91 alloy to hot tearing. The hot tearing susceptivity (HTS) of alloys was experimentally measured by a constraint rod casting method. The results indicate that the HTS presents a ν-shaped tendency with the increase in Ca content, and reaches its minimum value in AZ91–0.1Ca alloy. Ca is well dissolved into α-Mg matrix and Mg(17)Al(12) phase at an addition not exceeding 0.1 wt.%. The solid-solution behavior of Ca increases eutectic content and its corresponding liquid film thickness, improves the strength of dendrites at high temperature, and thereby promotes the hot tearing resistance of the alloy. Al(2)Ca phases appear and aggregate at dendrite boundaries with further increases in Ca above 0.1 wt.%. The coarsened Al(2)Ca phase hinders the feeding channel and causes stress concentration during the solidification shrinkage, thereby deteriorating the hot tearing resistance of the alloy. These findings were further verified by fracture morphology observations and microscopic strain analysis near the fracture surface based on kernel average misorientation (KAM). |
format | Online Article Text |
id | pubmed-10220820 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-102208202023-05-28 Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca Xiang, Hongchen Liu, Wenjun Wang, Qiang Jiang, Bin Song, Jiangfeng Wu, Hang Feng, Nan Chai, Linjiang Materials (Basel) Article Hot tearing is the most common and serious casting defect that restricts the light weight and integration of magnesium alloy components. In the present study, trace Ca (0–1.0 wt.%) was added to improve the resistance of AZ91 alloy to hot tearing. The hot tearing susceptivity (HTS) of alloys was experimentally measured by a constraint rod casting method. The results indicate that the HTS presents a ν-shaped tendency with the increase in Ca content, and reaches its minimum value in AZ91–0.1Ca alloy. Ca is well dissolved into α-Mg matrix and Mg(17)Al(12) phase at an addition not exceeding 0.1 wt.%. The solid-solution behavior of Ca increases eutectic content and its corresponding liquid film thickness, improves the strength of dendrites at high temperature, and thereby promotes the hot tearing resistance of the alloy. Al(2)Ca phases appear and aggregate at dendrite boundaries with further increases in Ca above 0.1 wt.%. The coarsened Al(2)Ca phase hinders the feeding channel and causes stress concentration during the solidification shrinkage, thereby deteriorating the hot tearing resistance of the alloy. These findings were further verified by fracture morphology observations and microscopic strain analysis near the fracture surface based on kernel average misorientation (KAM). MDPI 2023-05-22 /pmc/articles/PMC10220820/ /pubmed/37241513 http://dx.doi.org/10.3390/ma16103886 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Xiang, Hongchen Liu, Wenjun Wang, Qiang Jiang, Bin Song, Jiangfeng Wu, Hang Feng, Nan Chai, Linjiang Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca |
title | Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca |
title_full | Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca |
title_fullStr | Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca |
title_full_unstemmed | Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca |
title_short | Improvement of Hot Tearing Resistance of AZ91 Alloy with the Addition of Trace Ca |
title_sort | improvement of hot tearing resistance of az91 alloy with the addition of trace ca |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10220820/ https://www.ncbi.nlm.nih.gov/pubmed/37241513 http://dx.doi.org/10.3390/ma16103886 |
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