Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tension
Loading rate is usually considered as a significant factor affecting formability of AZ91 magnesium alloy structural components. Herein, uniaxial tensile tests are conducted on extruded-annealed AZ91 alloy under room temperature with strain rates ranging from 1 × 10−4 s−1 to 1 × 10−2 s−1. Mechanical...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423027783 |
| _version_ | 1797301444874862592 |
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| author | Fang Chai Zhiyuan Ma Xinghui Han Xuan Hu Zhenyu Chang Jianxin Zhou |
| author_facet | Fang Chai Zhiyuan Ma Xinghui Han Xuan Hu Zhenyu Chang Jianxin Zhou |
| author_sort | Fang Chai |
| collection | DOAJ |
| description | Loading rate is usually considered as a significant factor affecting formability of AZ91 magnesium alloy structural components. Herein, uniaxial tensile tests are conducted on extruded-annealed AZ91 alloy under room temperature with strain rates ranging from 1 × 10−4 s−1 to 1 × 10−2 s−1. Mechanical properties, microstructure characteristics, and fracture morphologies tensioned at these different strain rates are investigated. Extruded-annealed AZ91 alloy exhibits a positive strain-rate dependence of strength and a negative strain-rate dependence of elongation. With strain rate increasing, strain rate sensitivity basically decreases while strain-hardening rate increases. At higher strain rate, the larger strength is mainly attributed to the more rapid accumulation of dislocation and the larger dislocation density, and the lower elongation is mostly owing to the more elevated level of inhomogeneous deformation related with dislocations accumulation. As strain rate increases, the area fraction of basal texture increases while that of prismatic and pyramid texture decreases in tensioned samples, which is associated with the dominant room-temperature deformation mode of basal-slip and twinning co-induced lattice rotation. With tension strain rate increasing, there are three kinds of fracture modes including ductile facture with more and deeper dimples at low strain rate, ductile-brittle facture with some dimples and cleavage planes at mediate strain rate and brittle facture with dominant cleavage planes at high strain rate. |
| first_indexed | 2024-03-07T23:22:39Z |
| format | Article |
| id | doaj.art-423e586d6f29471397c910d05927e855 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:22:39Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-423e586d6f29471397c910d05927e8552024-02-21T05:27:25ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012746444656Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tensionFang Chai0Zhiyuan Ma1Xinghui Han2Xuan Hu3Zhenyu Chang4Jianxin Zhou5Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, PR China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, PR China; Hubei Engineering Technology Center for New Energy and Intelligent Connected Vehicles, Wuhan University of Technology, Wuhan, PR ChinaHubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, PR China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, PR China; Hubei Engineering Technology Center for New Energy and Intelligent Connected Vehicles, Wuhan University of Technology, Wuhan, PR ChinaHubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, PR China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, PR China; Hubei Engineering Technology Center for New Energy and Intelligent Connected Vehicles, Wuhan University of Technology, Wuhan, PR China; Hubei Longzhong Laboratory, Xiangyang, 441000, Hubei, PR China; Corresponding author. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, PR China.Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, PR China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, PR China; Hubei Engineering Technology Center for New Energy and Intelligent Connected Vehicles, Wuhan University of Technology, Wuhan, PR ChinaHubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan, PR China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, PR China; Hubei Engineering Technology Center for New Energy and Intelligent Connected Vehicles, Wuhan University of Technology, Wuhan, PR ChinaState Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, PR ChinaLoading rate is usually considered as a significant factor affecting formability of AZ91 magnesium alloy structural components. Herein, uniaxial tensile tests are conducted on extruded-annealed AZ91 alloy under room temperature with strain rates ranging from 1 × 10−4 s−1 to 1 × 10−2 s−1. Mechanical properties, microstructure characteristics, and fracture morphologies tensioned at these different strain rates are investigated. Extruded-annealed AZ91 alloy exhibits a positive strain-rate dependence of strength and a negative strain-rate dependence of elongation. With strain rate increasing, strain rate sensitivity basically decreases while strain-hardening rate increases. At higher strain rate, the larger strength is mainly attributed to the more rapid accumulation of dislocation and the larger dislocation density, and the lower elongation is mostly owing to the more elevated level of inhomogeneous deformation related with dislocations accumulation. As strain rate increases, the area fraction of basal texture increases while that of prismatic and pyramid texture decreases in tensioned samples, which is associated with the dominant room-temperature deformation mode of basal-slip and twinning co-induced lattice rotation. With tension strain rate increasing, there are three kinds of fracture modes including ductile facture with more and deeper dimples at low strain rate, ductile-brittle facture with some dimples and cleavage planes at mediate strain rate and brittle facture with dominant cleavage planes at high strain rate.http://www.sciencedirect.com/science/article/pii/S2238785423027783AZ91 magnesium alloyStrain rateMechanical propertiesMicrostructure evolutionRoom-temperature tension |
| spellingShingle | Fang Chai Zhiyuan Ma Xinghui Han Xuan Hu Zhenyu Chang Jianxin Zhou Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tension Journal of Materials Research and Technology AZ91 magnesium alloy Strain rate Mechanical properties Microstructure evolution Room-temperature tension |
| title | Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tension |
| title_full | Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tension |
| title_fullStr | Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tension |
| title_full_unstemmed | Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tension |
| title_short | Effect of strain rates on mechanical behavior, microstructure evolution and failure mechanism of extruded-annealed AZ91 magnesium alloy under room-temperature tension |
| title_sort | effect of strain rates on mechanical behavior microstructure evolution and failure mechanism of extruded annealed az91 magnesium alloy under room temperature tension |
| topic | AZ91 magnesium alloy Strain rate Mechanical properties Microstructure evolution Room-temperature tension |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423027783 |
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