Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloy
To systematically investigate the effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg(A357) cast alloy, A357 alloys with different Gd additions were investigated by OM, SEM, EPMA, XRD, DSC, TEM and tensile test. The results show that the addition of Gd can refine...
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2019-06-01
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| Series: | Cailiao gongcheng |
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| Online Access: | http://jme.biam.ac.cn/CN/Y2019/V47/I6/129 |
| _version_ | 1797968156024635392 |
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| author | LIU Wen-yi XU Cong LIU Mao-wen XIAO Wen-long MA Chao-li |
| author_facet | LIU Wen-yi XU Cong LIU Mao-wen XIAO Wen-long MA Chao-li |
| author_sort | LIU Wen-yi |
| collection | DOAJ |
| description | To systematically investigate the effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg(A357) cast alloy, A357 alloys with different Gd additions were investigated by OM, SEM, EPMA, XRD, DSC, TEM and tensile test. The results show that the addition of Gd can refine the grain and secondary dendrite arm spacing of the alloy. Besides, Gd refines eutectic Si, instead of transforming its morphology. The mechanical properties are improved by Gd addition due to obvious refinement of the grain and eutectic Si, the reduction of secondary dendrite arm spacing. For the A357-0.5Gd(mass fraction/%) alloy, the ultimate tensile strength(UTS) is 355MPa, which is 37MPa higher than that of the alloy without Gd. However, when increasing the Gd mass fraction to 1.0%, the formation of a high number of coarse Al<sub>2</sub>Si<sub>2</sub> Gd results in the decrease of the mechanical properties of the alloy.The refinement mechanism of Gd was investigated.Combined with the TEM observation, it can be inferred that the Gd addition produces fewer twins but some nanosized particles within eutectic Si. The density of twins is not high enough to cause the morphology transition of eutectic Si. The refinement effect of Gd on eutectic Si may be attributed to the increase of constitutional overcooling and the formation of nanosized particles, inhibiting the growth of eutectic Si during solidification. |
| first_indexed | 2024-04-11T02:42:30Z |
| format | Article |
| id | doaj.art-a8dbba8d337641e9bfaaf42d4daf86a6 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 1001-4381 |
| language | zho |
| last_indexed | 2024-04-11T02:42:30Z |
| publishDate | 2019-06-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-a8dbba8d337641e9bfaaf42d4daf86a62023-01-02T18:50:39ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812019-06-0147612913510.11868/j.issn.1001-4381.2017.000076201906000076Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloyLIU Wen-yi0XU Cong1LIU Mao-wen2XIAO Wen-long3MA Chao-li4Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, ChinaKey Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, ChinaKey Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, ChinaKey Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, ChinaKey Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, ChinaTo systematically investigate the effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg(A357) cast alloy, A357 alloys with different Gd additions were investigated by OM, SEM, EPMA, XRD, DSC, TEM and tensile test. The results show that the addition of Gd can refine the grain and secondary dendrite arm spacing of the alloy. Besides, Gd refines eutectic Si, instead of transforming its morphology. The mechanical properties are improved by Gd addition due to obvious refinement of the grain and eutectic Si, the reduction of secondary dendrite arm spacing. For the A357-0.5Gd(mass fraction/%) alloy, the ultimate tensile strength(UTS) is 355MPa, which is 37MPa higher than that of the alloy without Gd. However, when increasing the Gd mass fraction to 1.0%, the formation of a high number of coarse Al<sub>2</sub>Si<sub>2</sub> Gd results in the decrease of the mechanical properties of the alloy.The refinement mechanism of Gd was investigated.Combined with the TEM observation, it can be inferred that the Gd addition produces fewer twins but some nanosized particles within eutectic Si. The density of twins is not high enough to cause the morphology transition of eutectic Si. The refinement effect of Gd on eutectic Si may be attributed to the increase of constitutional overcooling and the formation of nanosized particles, inhibiting the growth of eutectic Si during solidification.http://jme.biam.ac.cn/CN/Y2019/V47/I6/129Al-Si alloyrare earth Gdrefinementmicrostructuremechanical property |
| spellingShingle | LIU Wen-yi XU Cong LIU Mao-wen XIAO Wen-long MA Chao-li Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloy Cailiao gongcheng Al-Si alloy rare earth Gd refinement microstructure mechanical property |
| title | Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloy |
| title_full | Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloy |
| title_fullStr | Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloy |
| title_full_unstemmed | Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloy |
| title_short | Effect of rare earth element Gd on microstructure and mechanical properties of Al-Si-Mg cast alloy |
| title_sort | effect of rare earth element gd on microstructure and mechanical properties of al si mg cast alloy |
| topic | Al-Si alloy rare earth Gd refinement microstructure mechanical property |
| url | http://jme.biam.ac.cn/CN/Y2019/V47/I6/129 |
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