Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements
Wrought AZ (Mg−Al−Zn) series alloys have attracted lots of researches, due to low cost, high strength and good formability. Few researches focus on creep characteristics of wrought AZ series alloys, which might be of significance to extensive use of low-cost wrought Mg−...
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| Format: | Article |
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MDPI AG
2019-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/9/954 |
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| author | Fangfang Wu Cheng Qin Yuan Zheng Weijian Pan Heng Ma Tingting Li Cheng Ye Xiujuan Ma Zhibing Chu Liren Cheng Chaojie Che |
| author_facet | Fangfang Wu Cheng Qin Yuan Zheng Weijian Pan Heng Ma Tingting Li Cheng Ye Xiujuan Ma Zhibing Chu Liren Cheng Chaojie Che |
| author_sort | Fangfang Wu |
| collection | DOAJ |
| description | Wrought AZ (Mg−Al−Zn) series alloys have attracted lots of researches, due to low cost, high strength and good formability. Few researches focus on creep characteristics of wrought AZ series alloys, which might be of significance to extensive use of low-cost wrought Mg−Al based alloy at elevated temperature. The microstructures, tensile properties and creep characteristics of as-extruded Mg-9Al-Zn-0.5RE-0.5Ca-0.5Si (wt.%, named AZXSE91000) alloy were investigated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffractometer (XRD), TEM (transmission electron microscopy), tensile tests and tensile creep tests (40−100 MPa, 125−150 °C). The as-extruded AZXSE91000 alloy exhibited good tensile strength both at room temperature and elevated temperature. The co-addition of Si, Ca and rare earth elements can improve the heat resistance of as-extruded AZ91 alloy resulting from fragmented heat-resistant particles hindering grain boundaries sliding. The steady creep rates of as-extruded AZXSE91000 alloy can be comparable with that of as-cast AZ91 alloy under similar experimental conditions. Dislocation climbing and grain boundary slip should dominantly contribute to the creep of as-extruded AZXSE91000 alloy. The asymmetric discontinuous precipitation in crept samples revealed that diffusion played an unneglected role during the creep process. |
| first_indexed | 2024-12-20T16:54:13Z |
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| id | doaj.art-bcb29b3482f4484fb8bd0691b2d4012f |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-20T16:54:13Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-bcb29b3482f4484fb8bd0691b2d4012f2022-12-21T19:32:46ZengMDPI AGMetals2075-47012019-08-019995410.3390/met9090954met9090954Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth ElementsFangfang Wu0Cheng Qin1Yuan Zheng2Weijian Pan3Heng Ma4Tingting Li5Cheng Ye6Xiujuan Ma7Zhibing Chu8Liren Cheng9Chaojie Che10Zhejiang Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. LTD, Hangzhou 310015, ChinaState Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun 130022, ChinaState Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun 130022, ChinaZhejiang Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. LTD, Hangzhou 310015, ChinaZhejiang Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. LTD, Hangzhou 310015, ChinaZhejiang Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. LTD, Hangzhou 310015, ChinaZhejiang Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. LTD, Hangzhou 310015, ChinaZhejiang Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. LTD, Hangzhou 310015, ChinaHeavy Machinery Engineering Research Center of the Ministry of Education, Taiyuan University of Science and Technology, Taiyuan 030024, ChinaState Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun 130022, ChinaHeavy Machinery Engineering Research Center of the Ministry of Education, Taiyuan University of Science and Technology, Taiyuan 030024, ChinaWrought AZ (Mg−Al−Zn) series alloys have attracted lots of researches, due to low cost, high strength and good formability. Few researches focus on creep characteristics of wrought AZ series alloys, which might be of significance to extensive use of low-cost wrought Mg−Al based alloy at elevated temperature. The microstructures, tensile properties and creep characteristics of as-extruded Mg-9Al-Zn-0.5RE-0.5Ca-0.5Si (wt.%, named AZXSE91000) alloy were investigated by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffractometer (XRD), TEM (transmission electron microscopy), tensile tests and tensile creep tests (40−100 MPa, 125−150 °C). The as-extruded AZXSE91000 alloy exhibited good tensile strength both at room temperature and elevated temperature. The co-addition of Si, Ca and rare earth elements can improve the heat resistance of as-extruded AZ91 alloy resulting from fragmented heat-resistant particles hindering grain boundaries sliding. The steady creep rates of as-extruded AZXSE91000 alloy can be comparable with that of as-cast AZ91 alloy under similar experimental conditions. Dislocation climbing and grain boundary slip should dominantly contribute to the creep of as-extruded AZXSE91000 alloy. The asymmetric discontinuous precipitation in crept samples revealed that diffusion played an unneglected role during the creep process.https://www.mdpi.com/2075-4701/9/9/954magnesium alloycreep characteristicswrought AZ91 alloyheat resistancegrain boundary slipdislocation climbingdiffusion |
| spellingShingle | Fangfang Wu Cheng Qin Yuan Zheng Weijian Pan Heng Ma Tingting Li Cheng Ye Xiujuan Ma Zhibing Chu Liren Cheng Chaojie Che Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements Metals magnesium alloy creep characteristics wrought AZ91 alloy heat resistance grain boundary slip dislocation climbing diffusion |
| title | Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements |
| title_full | Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements |
| title_fullStr | Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements |
| title_full_unstemmed | Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements |
| title_short | Microstructures, Tensile Properties and Creep Characteristics of as-Extruded AZ91 Magnesium Alloy Containing Si, Ca and Rare Earth Elements |
| title_sort | microstructures tensile properties and creep characteristics of as extruded az91 magnesium alloy containing si ca and rare earth elements |
| topic | magnesium alloy creep characteristics wrought AZ91 alloy heat resistance grain boundary slip dislocation climbing diffusion |
| url | https://www.mdpi.com/2075-4701/9/9/954 |
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