Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy
Quasicrystal-strengthened Mg-Zn-RE (RE = rare-earth element) alloys have been investigated extensively due to their excellent mechanical properties. Here, we prepare quasicrystal-strengthened Mg-7.2Zn-2.4Gd (wt.%) alloy with different concentrations of Ca addition (0, 0.16, 0.32, and 0.64 wt.%) by t...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
|
| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/9138753 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832556232623259648 |
|---|---|
| author | Jianchun Sun Yilong Ma Hongwei Miao Kejian Li Chunhong Li Hua Huang |
| author_facet | Jianchun Sun Yilong Ma Hongwei Miao Kejian Li Chunhong Li Hua Huang |
| author_sort | Jianchun Sun |
| collection | DOAJ |
| description | Quasicrystal-strengthened Mg-Zn-RE (RE = rare-earth element) alloys have been investigated extensively due to their excellent mechanical properties. Here, we prepare quasicrystal-strengthened Mg-7.2Zn-2.4Gd (wt.%) alloy with different concentrations of Ca addition (0, 0.16, 0.32, and 0.64 wt.%) by traditional gravity casting, followed by extrusion at 573 K with the extrusion ratio of 9 : 1. The microstructure and room temperature tensile properties of as-cast and as-extruded alloys are characterized. With the addition of the trace amount of Ca, the I-phase tends to transfer into W-phase due to the appearance of Mg2Ca and Mg6Zn3Ca2. As a consequence, the mechanical properties of the as-cast Ca containing alloys are downgraded. After extrusion, in comparison to the as-cast alloys, microstructure of the four types of alloys is refined and mechanical property is enhanced greatly. With the increasing of Ca concentration, the grain size is decreased gradually. However, the yield strength of the alloys is decreased to about 230 MPa and then up to 269 MPa, while the elongation increases first from 12.9% to 13.6% yet then decreases to 9.9%. |
| format | Article |
| id | doaj-art-f00e98092d82428fa107dcc2a12d2571 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-f00e98092d82428fa107dcc2a12d25712025-02-03T05:46:03ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/91387539138753Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd AlloyJianchun Sun0Yilong Ma1Hongwei Miao2Kejian Li3Chunhong Li4Hua Huang5School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaNational Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, ChinaSchool of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaNational Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, ChinaQuasicrystal-strengthened Mg-Zn-RE (RE = rare-earth element) alloys have been investigated extensively due to their excellent mechanical properties. Here, we prepare quasicrystal-strengthened Mg-7.2Zn-2.4Gd (wt.%) alloy with different concentrations of Ca addition (0, 0.16, 0.32, and 0.64 wt.%) by traditional gravity casting, followed by extrusion at 573 K with the extrusion ratio of 9 : 1. The microstructure and room temperature tensile properties of as-cast and as-extruded alloys are characterized. With the addition of the trace amount of Ca, the I-phase tends to transfer into W-phase due to the appearance of Mg2Ca and Mg6Zn3Ca2. As a consequence, the mechanical properties of the as-cast Ca containing alloys are downgraded. After extrusion, in comparison to the as-cast alloys, microstructure of the four types of alloys is refined and mechanical property is enhanced greatly. With the increasing of Ca concentration, the grain size is decreased gradually. However, the yield strength of the alloys is decreased to about 230 MPa and then up to 269 MPa, while the elongation increases first from 12.9% to 13.6% yet then decreases to 9.9%.http://dx.doi.org/10.1155/2018/9138753 |
| spellingShingle | Jianchun Sun Yilong Ma Hongwei Miao Kejian Li Chunhong Li Hua Huang Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy Advances in Materials Science and Engineering |
| title | Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy |
| title_full | Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy |
| title_fullStr | Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy |
| title_full_unstemmed | Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy |
| title_short | Effect of Ca Concentration on Microstructure and Mechanical Properties of As-Cast and As-Extruded Quasicrystal-Strengthened Mg-7.2Zn-2.4Gd Alloy |
| title_sort | effect of ca concentration on microstructure and mechanical properties of as cast and as extruded quasicrystal strengthened mg 7 2zn 2 4gd alloy |
| url | http://dx.doi.org/10.1155/2018/9138753 |
| work_keys_str_mv | AT jianchunsun effectofcaconcentrationonmicrostructureandmechanicalpropertiesofascastandasextrudedquasicrystalstrengthenedmg72zn24gdalloy AT yilongma effectofcaconcentrationonmicrostructureandmechanicalpropertiesofascastandasextrudedquasicrystalstrengthenedmg72zn24gdalloy AT hongweimiao effectofcaconcentrationonmicrostructureandmechanicalpropertiesofascastandasextrudedquasicrystalstrengthenedmg72zn24gdalloy AT kejianli effectofcaconcentrationonmicrostructureandmechanicalpropertiesofascastandasextrudedquasicrystalstrengthenedmg72zn24gdalloy AT chunhongli effectofcaconcentrationonmicrostructureandmechanicalpropertiesofascastandasextrudedquasicrystalstrengthenedmg72zn24gdalloy AT huahuang effectofcaconcentrationonmicrostructureandmechanicalpropertiesofascastandasextrudedquasicrystalstrengthenedmg72zn24gdalloy |