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Fan R, Wang L, Zhao S, Wang L, Guo E. Strengthening of Mg Alloy with Multiple RE Elements with Ag and Zn Doping via Heat Treatment. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16114155. [PMID: 37297288 DOI: 10.3390/ma16114155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 05/24/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023]
Abstract
Strengthening Mg alloys with rare earth elements has been a research focus for several decades. To minimize the usage of rare earth elements while enhancing mechanical properties, we adopted the strategy of alloying with multiple rare earth elements, namely Gd, Y, Nd, and Sm. Additionally, to promote the precipitation of basal precipitate, Ag and Zn doping was also induced. Thus, we designed a new cast Mg-2Gd-2Y-2Nd-2Sm-1Ag-1Zn-0.5Zr (wt.%) alloy. The microstructure of the alloy and its relevance to mechanical properties in various heat treatment conditions were investigated. After undergoing a heat treatment process, the alloy demonstrated exceptional mechanical properties, with a yield strength of 228 MPa and an ultimate tensile strength of 330 MPa achieved through peak-aging for 72 h at 200 °C. The excellent tensile properties are due to the synergistic effect of basal γ″ precipitate and prismatic β' precipitate. In its as-cast state, its primary mode of fracture is inter-granular, whereas in the solid-solution and peak-aging conditions, the predominant mode of fracture is a mixture of trans-granular and inter-granular fractures.
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Affiliation(s)
- Rui Fan
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- School of Mechanical and Electrical Engineering, Qiqihar University, Qiqihar 161000, China
- The Engineering Technology Research Center for Precision Manufacturing Equipment and Industrial Perception of Heilongjiang Provincae, Qiqihar 161000, China
- The Collaborative Innovation Center for Intelligent Manufacturing Equipment Industrialization, Qiqihar 161000, China
| | - Lei Wang
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
| | - Sicong Zhao
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
| | - Liping Wang
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
| | - Erjun Guo
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
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Zhao L, Zhao S, Feng Y, Wang L, Fan R, Ma T, Wang L. Effect of Solution Treatment Time on Microstructure Evolution and Properties of Mg-3Y-4Nd-2Al Alloy. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16062512. [PMID: 36984392 PMCID: PMC10052546 DOI: 10.3390/ma16062512] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/11/2023] [Accepted: 03/17/2023] [Indexed: 06/12/2023]
Abstract
In order to explore the microstructure evolution of an Mg-RE alloy refined by Al during solution treatment, an Mg-3Y-4Nd-2Al alloy was treated at 545 °C for different time periods. Phase evolution of the alloy was investigated. After solution treatment, the Mg-RE eutectic phase in the Mg-3Y-4Nd-2Al alloy dissolves, the granular Al2RE phase does not change, the acicular Al11RE3 phase breaks into the short rod-like Al2RE phase, and the lamellar Al2RE phase precipitates in the grains. With the extension of solution time, the precipitated phase of the lamellar Al2RE increased at first and then decreased, and its orientation relationship with the matrix is <112>Al2RE//<21¯1¯0>Mg and {111}Al2RE//{0002}Mg. The undissolved granular Al2RE phase can improve the thermal stability of the alloy grain by pinning the grain boundary, and the grain size did not change after solution treatment. Solution treatment significantly improved the plasticity of the alloy. After 48 h of solution treatment, the elongation increased to 17.5% from 8.5% in the as-cast state.
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Affiliation(s)
- Lili Zhao
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), Harbin University of Science and Technology, Harbin 150000, China
- College of Light Industry, Harbin University of Commerce, Harbin 150028, China
| | - Sicong Zhao
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), Harbin University of Science and Technology, Harbin 150000, China
| | - Yicheng Feng
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), Harbin University of Science and Technology, Harbin 150000, China
| | - Lei Wang
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), Harbin University of Science and Technology, Harbin 150000, China
| | - Rui Fan
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), Harbin University of Science and Technology, Harbin 150000, China
| | - Tao Ma
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), Harbin University of Science and Technology, Harbin 150000, China
| | - Liping Wang
- School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
- Key Laboratory of Advanced Manufacturing and Intelligent Technology (Ministry of Education), Harbin University of Science and Technology, Harbin 150000, China
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