Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloy
In this paper, the high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr and Mg-7Gd-3Nd-0.4Zr casting alloys were investigated. The results showed that substituting Gd with 3 wt% Nd promoted precipitation of the β′ phase with higher number densities and larger aspect ratios, which led to the h...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423015776 |
| _version_ | 1797745201903566848 |
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| author | He Qin Guangyu Yang Zhiyong Kan Chunhui Wang Shuxia Ouyang Wanqi Jie |
| author_facet | He Qin Guangyu Yang Zhiyong Kan Chunhui Wang Shuxia Ouyang Wanqi Jie |
| author_sort | He Qin |
| collection | DOAJ |
| description | In this paper, the high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr and Mg-7Gd-3Nd-0.4Zr casting alloys were investigated. The results showed that substituting Gd with 3 wt% Nd promoted precipitation of the β′ phase with higher number densities and larger aspect ratios, which led to the higher tensile mechanical properties of the peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy at both room and elevated temperatures. The peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy had better tensile creep properties at temperatures of 200 °C–225 °C. However, the peak-aged Mg-10Gd-0.4Zr casting alloy showed better creep resistance when the creep temperature ≥250 °C. The creep mechanism for the peak-aged Mg-10Gd-0.4Zr casting alloy was dislocation climb assisted by grain boundary diffusion under all experimental conditions, while the creep mechanism of the peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy transformed from dislocation glide at 200 °C–225 °C into dislocation cross-slip above 250 °C. Due to the faster transformation from β′ phase into β1 phase in peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy, the blocking effect of precipitation on dislocation movement was weakened. And a larger number of basal < a > dislocations accumulated in the grain boundary region, leading to precipitate free zones (PFZs) widening more obviously in the peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy, and which well explained the reason why the creep resistance of peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy deteriorated rapidly above 250 °C. |
| first_indexed | 2024-03-12T15:19:59Z |
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| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-12T15:19:59Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-885db04ea7b74a0aa1d735932a1c71a92023-08-11T05:34:21ZengElsevierJournal of Materials Research and Technology2238-78542023-07-012557815794Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloyHe Qin0Guangyu Yang1Zhiyong Kan2Chunhui Wang3Shuxia Ouyang4Wanqi Jie5State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaCorresponding author.; State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, PR ChinaIn this paper, the high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr and Mg-7Gd-3Nd-0.4Zr casting alloys were investigated. The results showed that substituting Gd with 3 wt% Nd promoted precipitation of the β′ phase with higher number densities and larger aspect ratios, which led to the higher tensile mechanical properties of the peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy at both room and elevated temperatures. The peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy had better tensile creep properties at temperatures of 200 °C–225 °C. However, the peak-aged Mg-10Gd-0.4Zr casting alloy showed better creep resistance when the creep temperature ≥250 °C. The creep mechanism for the peak-aged Mg-10Gd-0.4Zr casting alloy was dislocation climb assisted by grain boundary diffusion under all experimental conditions, while the creep mechanism of the peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy transformed from dislocation glide at 200 °C–225 °C into dislocation cross-slip above 250 °C. Due to the faster transformation from β′ phase into β1 phase in peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy, the blocking effect of precipitation on dislocation movement was weakened. And a larger number of basal < a > dislocations accumulated in the grain boundary region, leading to precipitate free zones (PFZs) widening more obviously in the peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy, and which well explained the reason why the creep resistance of peak-aged Mg-7Gd-3Nd-0.4Zr casting alloy deteriorated rapidly above 250 °C.http://www.sciencedirect.com/science/article/pii/S2238785423015776Casting Mg alloyPrecipitation transformationPFZs wideningCreep resistance |
| spellingShingle | He Qin Guangyu Yang Zhiyong Kan Chunhui Wang Shuxia Ouyang Wanqi Jie Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloy Journal of Materials Research and Technology Casting Mg alloy Precipitation transformation PFZs widening Creep resistance |
| title | Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloy |
| title_full | Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloy |
| title_fullStr | Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloy |
| title_full_unstemmed | Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloy |
| title_short | Effect of substituting Gd with 3 wt% Nd on high temperature creep behaviors of peak-aged Mg-10Gd-0.4Zr casting Mg alloy |
| title_sort | effect of substituting gd with 3 wt nd on high temperature creep behaviors of peak aged mg 10gd 0 4zr casting mg alloy |
| topic | Casting Mg alloy Precipitation transformation PFZs widening Creep resistance |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423015776 |
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