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Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing
Ameliorating the high-temperature performance of cast Al-Si alloys used as engine components is essential. The effects of different T6 heat-treatment processes on the microstructure and mechanical properties of cast Al-Si-Cu-Mg-Ni-Cr alloys were investigated in the present study. The results demonst...
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/PMC10095637/ https://www.ncbi.nlm.nih.gov/pubmed/37048968 http://dx.doi.org/10.3390/ma16072675 |
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author | Xiao, Lairong Yu, Huali Qin, Yiwei Liu, Guanqun Peng, Zhenwu Tu, Xiaoxuan Su, Heng Xiao, Yuxiang Zhong, Qi Wang, Sen Cai, Zhenyang Zhao, Xiaojun |
author_facet | Xiao, Lairong Yu, Huali Qin, Yiwei Liu, Guanqun Peng, Zhenwu Tu, Xiaoxuan Su, Heng Xiao, Yuxiang Zhong, Qi Wang, Sen Cai, Zhenyang Zhao, Xiaojun |
author_sort | Xiao, Lairong |
collection | PubMed |
description | Ameliorating the high-temperature performance of cast Al-Si alloys used as engine components is essential. The effects of different T6 heat-treatment processes on the microstructure and mechanical properties of cast Al-Si-Cu-Mg-Ni-Cr alloys were investigated in the present study. The results demonstrate that, under the optimal solution treatment conditions of 500 °C for 2 h and 540 °C for 4 h, the T-Al(9)FeNi phase was present in the alloy, and the roundness of primary Si and the aspect ratio of eutectic Si in the alloy reached valley values of 1.46 and 2.56, respectively. With increasing ageing time at 180 °C, the tensile strength significantly improved, while the microhardness first increased and then decreased. When the ageing time was 4 h, microhardness reached a peak value of 155.82 HV. The fracture characteristics changed from quasi-cleavage to the coexistence of quasi-cleavage and dimples. After heat treatment, the high-temperature tensile properties of the alloy improved, which is a significant advantage compared to the as-cast alloy. The stable Al(3)Ni and Al(9)FeNi phases inhibited the cracking of the alloy at 350 °C. |
format | Online Article Text |
id | pubmed-10095637 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-100956372023-04-13 Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing Xiao, Lairong Yu, Huali Qin, Yiwei Liu, Guanqun Peng, Zhenwu Tu, Xiaoxuan Su, Heng Xiao, Yuxiang Zhong, Qi Wang, Sen Cai, Zhenyang Zhao, Xiaojun Materials (Basel) Article Ameliorating the high-temperature performance of cast Al-Si alloys used as engine components is essential. The effects of different T6 heat-treatment processes on the microstructure and mechanical properties of cast Al-Si-Cu-Mg-Ni-Cr alloys were investigated in the present study. The results demonstrate that, under the optimal solution treatment conditions of 500 °C for 2 h and 540 °C for 4 h, the T-Al(9)FeNi phase was present in the alloy, and the roundness of primary Si and the aspect ratio of eutectic Si in the alloy reached valley values of 1.46 and 2.56, respectively. With increasing ageing time at 180 °C, the tensile strength significantly improved, while the microhardness first increased and then decreased. When the ageing time was 4 h, microhardness reached a peak value of 155.82 HV. The fracture characteristics changed from quasi-cleavage to the coexistence of quasi-cleavage and dimples. After heat treatment, the high-temperature tensile properties of the alloy improved, which is a significant advantage compared to the as-cast alloy. The stable Al(3)Ni and Al(9)FeNi phases inhibited the cracking of the alloy at 350 °C. MDPI 2023-03-28 /pmc/articles/PMC10095637/ /pubmed/37048968 http://dx.doi.org/10.3390/ma16072675 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 Xiao, Lairong Yu, Huali Qin, Yiwei Liu, Guanqun Peng, Zhenwu Tu, Xiaoxuan Su, Heng Xiao, Yuxiang Zhong, Qi Wang, Sen Cai, Zhenyang Zhao, Xiaojun Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing |
title | Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing |
title_full | Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing |
title_fullStr | Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing |
title_full_unstemmed | Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing |
title_short | Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing |
title_sort | microstructure and mechanical properties of cast al-si-cu-mg-ni-cr alloys: effects of time and temperature on two-stage solution treatment and ageing |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10095637/ https://www.ncbi.nlm.nih.gov/pubmed/37048968 http://dx.doi.org/10.3390/ma16072675 |
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