Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloy
The thermal conductivity (TC) and strength trade-off has been a long-standing dilemma for developing high TC alloys. Here a novel high TC and cost-effective die-cast Mg2.8Al3.8La0.4Nd alloy was developed with enhanced yield strength (YS) at room temperature (RT) and high temperatures (HT), compared...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422020142 |
| _version_ | 1797943026954272768 |
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| author | Lingyun Feng Xixi Dong Mingxu Xia Xiangzhen Zhu Gang Ji Hailin Yang Bin Wang Eric A. Nyberg Shouxun Ji |
| author_facet | Lingyun Feng Xixi Dong Mingxu Xia Xiangzhen Zhu Gang Ji Hailin Yang Bin Wang Eric A. Nyberg Shouxun Ji |
| author_sort | Lingyun Feng |
| collection | DOAJ |
| description | The thermal conductivity (TC) and strength trade-off has been a long-standing dilemma for developing high TC alloys. Here a novel high TC and cost-effective die-cast Mg2.8Al3.8La0.4Nd alloy was developed with enhanced yield strength (YS) at room temperature (RT) and high temperatures (HT), compared with the commercially widely used die-cast AE44 magnesium alloy. The new alloy provided the TC of 104.0 and 125.9 W/(m·K) separately at RT and 300 °C. Compared with AE44 alloy, the TC was improved by ∼13.5%. The new alloy also delivered an excellent YS of 137.1 MPa, ultimate tensile strength (UTS) of 240.2 MPa and elongation of 8.8% at RT, and the YS of the new ally was enhanced by 6.3% at RT and 9.8% at 300 °C, compared with AE44 alloy. The new alloy only has a 1.3% increase in raw material cost compared with AE44 alloy, offering a relatively cost-effective alternative. The lamellar (Al,Mg)3RE and Al11RE3, the needle-like Al2.12RE0.88 and the blocky Al10RE2Mn7 intermetallic phases were identified. With the optimizing addition of Al and La, the Al solute amount in the matrix was reduced remarkably by 42% and then contributed to the improvement of TC. The major (Al,Mg)3RE phase at grain boundaries (GBs) contributed heavily to the enhancement of YS. This study elucidates the importance of the transfer of Al from the matrix to form higher content and novel Al-based intermetallic phases at GBs, for achieving die-cast Mg-Al-based alloys with excellent TC and strength. |
| first_indexed | 2024-04-10T20:17:10Z |
| format | Article |
| id | doaj.art-8d4f92995c5a41a384304950b2c55837 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-10T20:17:10Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-8d4f92995c5a41a384304950b2c558372023-01-26T04:46:33ZengElsevierJournal of Materials Research and Technology2238-78542023-01-012229552966Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloyLingyun Feng0Xixi Dong1Mingxu Xia2Xiangzhen Zhu3Gang Ji4Hailin Yang5Bin Wang6Eric A. Nyberg7Shouxun Ji8Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, UB8 3PH, UKBrunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, UB8 3PH, UK; Corresponding author.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, ChinaBrunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, UB8 3PH, UKUniv. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000, Lille, FranceState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China; Corresponding author.Department of Mechanical Engineering and Aerospace, Brunel University London, Uxbridge Middlesex UB8 3PH, UKKaiser Aluminum, Spokane Valley, WA, 99216, USABrunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, UB8 3PH, UK; Corresponding author.The thermal conductivity (TC) and strength trade-off has been a long-standing dilemma for developing high TC alloys. Here a novel high TC and cost-effective die-cast Mg2.8Al3.8La0.4Nd alloy was developed with enhanced yield strength (YS) at room temperature (RT) and high temperatures (HT), compared with the commercially widely used die-cast AE44 magnesium alloy. The new alloy provided the TC of 104.0 and 125.9 W/(m·K) separately at RT and 300 °C. Compared with AE44 alloy, the TC was improved by ∼13.5%. The new alloy also delivered an excellent YS of 137.1 MPa, ultimate tensile strength (UTS) of 240.2 MPa and elongation of 8.8% at RT, and the YS of the new ally was enhanced by 6.3% at RT and 9.8% at 300 °C, compared with AE44 alloy. The new alloy only has a 1.3% increase in raw material cost compared with AE44 alloy, offering a relatively cost-effective alternative. The lamellar (Al,Mg)3RE and Al11RE3, the needle-like Al2.12RE0.88 and the blocky Al10RE2Mn7 intermetallic phases were identified. With the optimizing addition of Al and La, the Al solute amount in the matrix was reduced remarkably by 42% and then contributed to the improvement of TC. The major (Al,Mg)3RE phase at grain boundaries (GBs) contributed heavily to the enhancement of YS. This study elucidates the importance of the transfer of Al from the matrix to form higher content and novel Al-based intermetallic phases at GBs, for achieving die-cast Mg-Al-based alloys with excellent TC and strength.http://www.sciencedirect.com/science/article/pii/S2238785422020142Magnesium alloyDie-castConductivityMicrostructureMechanical properties |
| spellingShingle | Lingyun Feng Xixi Dong Mingxu Xia Xiangzhen Zhu Gang Ji Hailin Yang Bin Wang Eric A. Nyberg Shouxun Ji Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloy Journal of Materials Research and Technology Magnesium alloy Die-cast Conductivity Microstructure Mechanical properties |
| title | Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloy |
| title_full | Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloy |
| title_fullStr | Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloy |
| title_full_unstemmed | Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloy |
| title_short | Development of high thermal conductivity, enhanced strength and cost-effective die-cast Mg alloy compared with AE44 alloy |
| title_sort | development of high thermal conductivity enhanced strength and cost effective die cast mg alloy compared with ae44 alloy |
| topic | Magnesium alloy Die-cast Conductivity Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422020142 |
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