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Chen L, Yang W, Cui H, Wang Y, Xu Z. Morphology and Properties of Mg 2Si Phase Modified by Pb in As-Cast Mg-2.5Si- xPb Alloys. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1811. [PMID: 38673168 PMCID: PMC11050878 DOI: 10.3390/ma17081811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2024] [Revised: 04/11/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024]
Abstract
Pb plays an important role in determining the morphologies and mechanical properties of the Mg2Si phase in Mg-2.5Si-xPb alloys. As the amount of Pb increases from 0.4 wt.% to 1 wt.%, the primary Mg2Si phase is refined during solidification. Its morphologies transform from equiaxed-dendrite to polygonal and finally to roughly circular. The key reason for morphology evolution is the preferential adsorption of Pb atoms on Mg2Si {100} surfaces to suppress the growth rate along the ⟨100⟩ directions, which is demonstrated by the adsorption model based on first principles. In addition, the hardness of the Mg2Si phase decreases with the increasing solution content of Pb according to the results of the nanoindentation. With the addition of Pb at 1 wt.%, Pb content in the primary Mg2Si phase reaches a maximum of 0.4 wt.%, and the hardness of the primary Mg2Si phase reaches a minimum of 3.64 GPa. This reduction in hardness is attributed to the augmented ionic bond ratio resulting from the solution of Pb, which concurrently enhances the toughness of the Mg2Si phase.
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Affiliation(s)
- Liang Chen
- School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; (L.C.); (H.C.); (Y.W.); (Z.X.)
- School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
| | - Wenpeng Yang
- School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; (L.C.); (H.C.); (Y.W.); (Z.X.)
- Henan International Joint Research Laboratory for High-Performance Light Metallic Materials and Numerical Simulations, Jiaozuo 454000, China
| | - Hongbao Cui
- School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; (L.C.); (H.C.); (Y.W.); (Z.X.)
- Henan International Joint Research Laboratory for High-Performance Light Metallic Materials and Numerical Simulations, Jiaozuo 454000, China
| | - Ying Wang
- School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; (L.C.); (H.C.); (Y.W.); (Z.X.)
- Henan International Joint Research Laboratory for High-Performance Light Metallic Materials and Numerical Simulations, Jiaozuo 454000, China
| | - Zhichao Xu
- School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; (L.C.); (H.C.); (Y.W.); (Z.X.)
- Henan International Joint Research Laboratory for High-Performance Light Metallic Materials and Numerical Simulations, Jiaozuo 454000, China
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Yu HC, Men YZ, Yang SG, Liu H, Yu L, Xu XD, Li YF, Zou CS, Wang HN, Zhong WR. Morphology evolution of primary Mg 2Si in Ca-modified Al–Mg 2Si alloy with various contents of Mg/Si. CrystEngComm 2022. [DOI: 10.1039/d1ce01184g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The combined influence of Mg/Si and Ca contents on the crystallization of primary Mg2Si in Al–Mg2Si alloy is investigated.
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Affiliation(s)
- Hong-Chen Yu
- Changchun Institute of Technology, School of Mechanical and Electrical Engineering, No. 395 Kuanping Street, Changchun 130021, PR China
- Changchun Institute of Technology, School of Applied Technology, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Yu-Zhuo Men
- Changchun Institute of Technology, School of Mechanical and Electrical Engineering, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Shu-Guo Yang
- Changchun Institute of Technology, School of Mechanical and Electrical Engineering, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Hui Liu
- Changchun Institute of Technology, School of Mechanical and Electrical Engineering, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Lei Yu
- Changchun Institute of Technology, School of Mechanical and Electrical Engineering, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Xue-Dong Xu
- Changchun Institute of Technology, School of Mechanical and Electrical Engineering, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Yi-Fei Li
- Changchun Institute of Technology, School of Applied Technology, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Chang-Sheng Zou
- Changchun Institute of Technology, School of Applied Technology, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Hao-Nan Wang
- Changchun Institute of Technology, School of Applied Technology, No. 395 Kuanping Street, Changchun 130021, PR China
| | - Wei-Rong Zhong
- Changchun Institute of Technology, School of Mechanical and Electrical Engineering, No. 395 Kuanping Street, Changchun 130021, PR China
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Seth PP, Parkash O, Kumar D. Structure and mechanical behavior of in situ developed Mg 2Si phase in magnesium and aluminum alloys - a review. RSC Adv 2020; 10:37327-37345. [PMID: 35521263 PMCID: PMC9057142 DOI: 10.1039/d0ra02744h] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 06/26/2020] [Indexed: 12/03/2022] Open
Abstract
The demand for lightweight, high specific strength alloys has drastically increased in the last two decades. Magnesium and aluminum alloys are very suitable candidate materials. Research on alloys with an Mg2Si phase started about three decades ago. The current scenario is that magnesium and aluminum alloys containing an Mg2Si phase are very popular in the scientific community and extensively used in the automotive and aerospace industries. Mg2Si is a very stable phase and exhibits excellent mechanical, thermal, electrochemical and tribological properties. This paper presents a brief review of Mg–Si binary alloys, and Mg–Si–Al and Al–Si–Mg alloys. Grain refinement methods and mechanical properties have been reported on lightweight alloys containing Mg and Si. The available results show that silicon reacts with magnesium and forms an intermetallic compound with the stoichiometric formula Mg2Si. There is in situ formation of an Mg2Si phase in Mg–Si, Mg–Si–Al and Al–Mg–Si alloys by the diffusion or precipitation process. The morphology and size of an in situ developed Mg2Si phase depend on the synthesis route and base metal or matrix. In the liquid metallurgy process the precipitation sequence depends on the cooling rate. The morphology of the Mg2Si phase depends on the precipitation sequence and the mechanical properties depend on the morphology and size of the Mg2Si phase within the alloy matrix. The demand for lightweight, high specific strength alloys has drastically increased in the last two decades.![]()
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Affiliation(s)
- Prem Prakash Seth
- Department of Ceramic Engineering, Indian Institute of Technology (BHU) Varanasi 221005 India
| | - Om Parkash
- Department of Ceramic Engineering, Indian Institute of Technology (BHU) Varanasi 221005 India
| | - Devendra Kumar
- Department of Ceramic Engineering, Indian Institute of Technology (BHU) Varanasi 221005 India
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Wang HY, Yu HC, Li C, Zha M, Wang C, Jiang QC. Morphology evolution of primary Mg 2Si in Al–20Mg 2Si–0.1Ca alloys prepared with various solidification cooling rates. CrystEngComm 2017. [DOI: 10.1039/c7ce00028f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chen L, Wang HY, Liu K, Wang C, Luo D, Jiang QC. Growth of Mg2Si crystals shaped by {100} and {111} facets from Al–Mg–Si melts in the presence of calcium. CrystEngComm 2017. [DOI: 10.1039/c7ce00404d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Influence of Li₂Sb Additions on Microstructure and Mechanical Properties of Al-20Mg₂Si Alloy. MATERIALS 2016; 9:ma9040243. [PMID: 28773367 PMCID: PMC5502895 DOI: 10.3390/ma9040243] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 03/13/2016] [Accepted: 03/21/2016] [Indexed: 11/21/2022]
Abstract
It is found that Li2Sb compound can act as the nucleus of primary Mg2Si during solidification, by which the particle size of primary Mg2Si decreased from ~300 to ~15–25 μm. Owing to the synergistic effect of the Li2Sb nucleus and adsorption-poisoning of Li atoms, the effect of complex modification of Li-Sb on primary Mg2Si was better than that of single modification of Li or Sb. When Li-Sb content increased from 0 to 0.2 and further to 0.5 wt.%, coarse dendrite changed to defective truncated octahedron and finally to perfect truncated octahedral shape. With the addition of Li and Sb, ultimate compression strength (UCS) of Al-20Mg2Si alloys increased from ~283 to ~341 MPa and the yield strength (YS) at 0.2% offset increased from ~112 to ~179 MPa while almost no change was seen in the uniform elongation. Our study offers a simple method to control the morphology and size of primary Mg2Si, which will inspire developing new Al-Mg-Si alloys with improved mechanical properties.
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Effects of Complex Modification by Sr-Sb on the Microstructures and Mechanical Properties of Al-18 wt % Mg₂Si-4.5Cu Alloys. MATERIALS 2016; 9:ma9030157. [PMID: 28773282 PMCID: PMC5456687 DOI: 10.3390/ma9030157] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 02/22/2016] [Accepted: 02/23/2016] [Indexed: 11/30/2022]
Abstract
This research was carried out to investigate the influence of Sr–Sb on the microstructures and mechanical properties of Al–18 wt % Mg2Si–4.5Cu alloys. After the addition of 0.2 wt % Sr–Sb, the morphologies of primary Mg2Si transformed from equiaxed dendrite to cube in as-cast alloys and the average size of primary Mg2Si decreased from ~50 to ~20 μm. The shape of eutectic Mg2Si changed from Chinese script to short rod. After extrusion and T6 heat treatment, the ultimate tensile strength of modified alloy at room temperature (RT) and 100 °C increased respectively from 229 to 288 MPa, and from 231 to 272 MPa. The elongation-to-failure only slightly improved from 2.9% to 3.8% and from 3.3% to 3.7% at RT and 100 °C, respectively. The tensile fracture surface revealed a transition from brittle fracture to ductile fracture after modifying by 0.2 wt % Sr–Sb.
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Effect of alloy elements on the morphology transformation of TiB2 particles in Al matrix. Micron 2015; 70:21-5. [DOI: 10.1016/j.micron.2014.12.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 12/02/2014] [Accepted: 12/03/2014] [Indexed: 11/23/2022]
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Yu HC, Wang HY, Chen L, Liu F, Wang C, Jiang QC. Heterogeneous nucleation of Mg2Si on CaSb2nucleus in Al–Mg–Si alloys. CrystEngComm 2015. [DOI: 10.1039/c5ce01271f] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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