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Liu J, Du Z, Peng Y, Jia R, Han X, Ma M, Li T. Study on the Microstructure of Mg-4Zn-4Sn-1Mn-xAl As-Cast Alloys. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6979. [PMID: 37959576 PMCID: PMC10649767 DOI: 10.3390/ma16216979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/08/2023] [Accepted: 10/10/2023] [Indexed: 11/15/2023]
Abstract
In this study, the microstructure of the Mg-4Zn-4Sn-1Mn-xAl (x = 0, 0.3 wt.%, denoted as ZTM441 and ZTM441-0.3Al) as-cast alloys was investigated using scanning electron microscopy (SEM), focused-ion/electron-beam (FIB) micromachining, transmission electron microscopy (TEM), and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The analysis results revealed that the microstructure of the ZTM441 and ZTM441-0.3Al as-cast alloys both mainly consist of the α-Mg matrix, skeleton-shaped MgZn2 eutectic texture, block-shaped Mg2Sn, and Zn/Sn-rich nanoscale precipitate bands along the grain boundary and the interdendrite. Nanoscale α-Mn dispersoids formed in the grain in the ZTM441 alloy, while no α-Mn formed in the ZTM441-0.3Al alloy instead of nanoscale Al3Mn2 particles. In the ZTM441 as-cast alloy, part of the Zn element is dissolved into the α-Mn phase, and part of the Mn element is dissolved into the MgZn2 phase, but in the ZTM441-0.3Al alloy, there are no such characteristics of mutual solubility. Zn and Mn elements are easy to combine in ZTM441 as-cast alloy, while Al and Mn are easy to combine in ZTM441-0.3Al as-cast alloy. The Mg-Zn phases have not only MgZn2-type crystal structure but also Mg4Zn7- and Mg149Zn-type crystal structure in the ZTM441-0.3Al as-cast alloy. The addition of Al changes the combination of Mn and Zn, promotes the formation of Al3Mn2, and the growth of the grain.
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Affiliation(s)
- Junlin Liu
- China GRINM Group Co., Ltd., National Center of Analysis and Testing for Non-Ferrous Metals & Electronic Materials, Beijing 100088, China; (J.L.); (Y.P.); (X.H.); (M.M.); (T.L.)
- Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 110407, China
- General Research Institute for Nonferrous Metals, Beijing 100088, China
- China United Test & Certification Co., Ltd., Beijing 110407, China
| | - Zhiwei Du
- China GRINM Group Co., Ltd., National Center of Analysis and Testing for Non-Ferrous Metals & Electronic Materials, Beijing 100088, China; (J.L.); (Y.P.); (X.H.); (M.M.); (T.L.)
- Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 110407, China
- China United Test & Certification Co., Ltd., Beijing 110407, China
| | - Yonggang Peng
- China GRINM Group Co., Ltd., National Center of Analysis and Testing for Non-Ferrous Metals & Electronic Materials, Beijing 100088, China; (J.L.); (Y.P.); (X.H.); (M.M.); (T.L.)
- Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 110407, China
- China United Test & Certification Co., Ltd., Beijing 110407, China
| | - Rongguang Jia
- China GRINM Group Co., Ltd., National Center of Analysis and Testing for Non-Ferrous Metals & Electronic Materials, Beijing 100088, China; (J.L.); (Y.P.); (X.H.); (M.M.); (T.L.)
- Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 110407, China
- China United Test & Certification Co., Ltd., Beijing 110407, China
| | - Xiaolei Han
- China GRINM Group Co., Ltd., National Center of Analysis and Testing for Non-Ferrous Metals & Electronic Materials, Beijing 100088, China; (J.L.); (Y.P.); (X.H.); (M.M.); (T.L.)
- Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 110407, China
- China United Test & Certification Co., Ltd., Beijing 110407, China
| | - Minglong Ma
- China GRINM Group Co., Ltd., National Center of Analysis and Testing for Non-Ferrous Metals & Electronic Materials, Beijing 100088, China; (J.L.); (Y.P.); (X.H.); (M.M.); (T.L.)
- State Key Laboratory of Non-Ferrous Metals & Processes, GRIMAT Engineering Institute Co., Ltd., Beijing 101407, China
| | - Ting Li
- China GRINM Group Co., Ltd., National Center of Analysis and Testing for Non-Ferrous Metals & Electronic Materials, Beijing 100088, China; (J.L.); (Y.P.); (X.H.); (M.M.); (T.L.)
- Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 110407, China
- China United Test & Certification Co., Ltd., Beijing 110407, China
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Yan S, Hou C, Zhang A, Qi F. Influence of Al Addition on the Microstructure and Mechanical Properties of Mg-Zn-Sn-Mn-Ca Alloys. MATERIALS (BASEL, SWITZERLAND) 2023; 16:ma16103664. [PMID: 37241291 DOI: 10.3390/ma16103664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023]
Abstract
The effects of Al addition on the microstructure and mechanical properties of Mg-Zn-Sn-Mn-Ca alloys are studied in this paper. It was found that the Mg-6Sn-4Zn-1Mn-0.2Ca-xAl (ZTM641-0.2Ca-xAl, x = 0, 0.5, 1, 2 wt.%; hereafter, all compositions are in weight percent unless stated otherwise) alloys have α-Mg, Mg2Sn, Mg7Zn3, MgZn, α-Mn, CaMgSn, AlMn, Mg32(Al,Zn)49 phases. The grain is also refined when the Al element is added, and the angular-block AlMn phases are formed in the alloys. For the ZTM641-0.2Ca-xAl alloy, the higher Al content is beneficial to elongation, and the double-aged ZTM641-0.2Ca-2Al alloy has the highest elongation, which is 13.2%. The higher Al content enhances the high-temperature strength for the as-extruded ZTM641-0.2Ca alloy; overall, the as-extruded ZTM641-0.2Ca-2Al alloy has the best performance; that is, the tensile strength and yield strength of the ZTM641-0.2Ca-2Al alloy are 159 MPa and 132 MPa at 150 °C, and 103 MPa and 90 MPa at 200 °C, respectively.
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Affiliation(s)
- Shujuan Yan
- National Energy Group Ningxia Coal Industry Co., Ltd., Yinchuan 750001, China
| | - Caihong Hou
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
| | - Angui Zhang
- National Energy Group Ningxia Coal Industry Co., Ltd., Yinchuan 750001, China
| | - Fugang Qi
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
- Hunan Bangzer Technology Co., Ltd., Xiangtan 411100, China
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