{"title":"纯Mg和稀释MgMn合金在非常高应变速率下的动态拉伸响应","authors":"Abdul Malik","doi":"10.1016/j.matchar.2025.115578","DOIUrl":null,"url":null,"abstract":"<div><div>Hetero deformation induced (HDI) and bi-modal grain structure induced (BI) hardening are effective ways to increase the performance of magnesium (Mg) alloys. However, loading rate, texture, and microstructure features play a decisive role in achieving the full advantage of these mechanisms. In particular, we reported that the heterogeneous grain structured Mg<img>Mn alloy and bimodal grain structured pure Mg, having low strength and low elongation to fracture (EF) under quasi-static (QS) loading, can show exceptionally high strength and high EF under high strain rate (HSR) loading. To prove it, we have conducted QS (<span><math><mover><mi>ε</mi><mo>̇</mo></mover><mo>=</mo><mn>0.001</mn><mspace></mspace><msup><mi>s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>) and HSR (<span><math><mover><mi>ε</mi><mo>̇</mo></mover><mo>=</mo><mn>2400</mn><mo>−</mo><mn>4200</mn><mspace></mspace><msup><mi>s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>) tensile properties of a bi-modal grain structure extruded Mg and a heterogeneous grain structure extruded Mg<img>Mn alloy having different textures. Subsequently, the ultimate tensile strength (UTS) ∼ 334 MPa is achieved for Mg under HSR loading, which is 110 % higher than the UTS (∼ 159 MPa) under QS loading. Likewise, the Mg<img>Mn alloy also displayed an exceptional UTS of ∼382 MPa, which is ∼105 % higher than the UTS (∼ 185 MPa) of the Mg<img>Mn alloy under QS loading. Most specifically, EF is 2-fold and ∼ 3–4 fold in Mg and Mg<img>Mn alloy under HSR compared to the QS loading. The results also revealed that Mg displayed structure instability, and Mg<img>Mn alloy displayed structure stability. Therefore, Mg<img>Mn alloy displayed a higher UTS ∼ 81 MPa than that of Mg under the same HSR (4100 and 4182 s<sup>−1</sup>). Thus, the maximum advantage of the HDI and BI mechanisms is attained at HSR loading, and the Mg and Mg<img>Mn alloy that were not high strength and ductile under QS loading are high strength and ductile under HSR tensile loading.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"229 ","pages":"Article 115578"},"PeriodicalIF":5.5000,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Outstanding dynamic tensile response of pure Mg and diluted MgMn alloy under very high strain rates\",\"authors\":\"Abdul Malik\",\"doi\":\"10.1016/j.matchar.2025.115578\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Hetero deformation induced (HDI) and bi-modal grain structure induced (BI) hardening are effective ways to increase the performance of magnesium (Mg) alloys. However, loading rate, texture, and microstructure features play a decisive role in achieving the full advantage of these mechanisms. In particular, we reported that the heterogeneous grain structured Mg<img>Mn alloy and bimodal grain structured pure Mg, having low strength and low elongation to fracture (EF) under quasi-static (QS) loading, can show exceptionally high strength and high EF under high strain rate (HSR) loading. To prove it, we have conducted QS (<span><math><mover><mi>ε</mi><mo>̇</mo></mover><mo>=</mo><mn>0.001</mn><mspace></mspace><msup><mi>s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>) and HSR (<span><math><mover><mi>ε</mi><mo>̇</mo></mover><mo>=</mo><mn>2400</mn><mo>−</mo><mn>4200</mn><mspace></mspace><msup><mi>s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>) tensile properties of a bi-modal grain structure extruded Mg and a heterogeneous grain structure extruded Mg<img>Mn alloy having different textures. Subsequently, the ultimate tensile strength (UTS) ∼ 334 MPa is achieved for Mg under HSR loading, which is 110 % higher than the UTS (∼ 159 MPa) under QS loading. Likewise, the Mg<img>Mn alloy also displayed an exceptional UTS of ∼382 MPa, which is ∼105 % higher than the UTS (∼ 185 MPa) of the Mg<img>Mn alloy under QS loading. Most specifically, EF is 2-fold and ∼ 3–4 fold in Mg and Mg<img>Mn alloy under HSR compared to the QS loading. The results also revealed that Mg displayed structure instability, and Mg<img>Mn alloy displayed structure stability. Therefore, Mg<img>Mn alloy displayed a higher UTS ∼ 81 MPa than that of Mg under the same HSR (4100 and 4182 s<sup>−1</sup>). Thus, the maximum advantage of the HDI and BI mechanisms is attained at HSR loading, and the Mg and Mg<img>Mn alloy that were not high strength and ductile under QS loading are high strength and ductile under HSR tensile loading.</div></div>\",\"PeriodicalId\":18727,\"journal\":{\"name\":\"Materials Characterization\",\"volume\":\"229 \",\"pages\":\"Article 115578\"},\"PeriodicalIF\":5.5000,\"publicationDate\":\"2025-09-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Materials Characterization\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1044580325008678\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, CHARACTERIZATION & TESTING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Characterization","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1044580325008678","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
Outstanding dynamic tensile response of pure Mg and diluted MgMn alloy under very high strain rates
Hetero deformation induced (HDI) and bi-modal grain structure induced (BI) hardening are effective ways to increase the performance of magnesium (Mg) alloys. However, loading rate, texture, and microstructure features play a decisive role in achieving the full advantage of these mechanisms. In particular, we reported that the heterogeneous grain structured MgMn alloy and bimodal grain structured pure Mg, having low strength and low elongation to fracture (EF) under quasi-static (QS) loading, can show exceptionally high strength and high EF under high strain rate (HSR) loading. To prove it, we have conducted QS () and HSR () tensile properties of a bi-modal grain structure extruded Mg and a heterogeneous grain structure extruded MgMn alloy having different textures. Subsequently, the ultimate tensile strength (UTS) ∼ 334 MPa is achieved for Mg under HSR loading, which is 110 % higher than the UTS (∼ 159 MPa) under QS loading. Likewise, the MgMn alloy also displayed an exceptional UTS of ∼382 MPa, which is ∼105 % higher than the UTS (∼ 185 MPa) of the MgMn alloy under QS loading. Most specifically, EF is 2-fold and ∼ 3–4 fold in Mg and MgMn alloy under HSR compared to the QS loading. The results also revealed that Mg displayed structure instability, and MgMn alloy displayed structure stability. Therefore, MgMn alloy displayed a higher UTS ∼ 81 MPa than that of Mg under the same HSR (4100 and 4182 s−1). Thus, the maximum advantage of the HDI and BI mechanisms is attained at HSR loading, and the Mg and MgMn alloy that were not high strength and ductile under QS loading are high strength and ductile under HSR tensile loading.
期刊介绍:
Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials.
The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal.
The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include:
Metals & Alloys
Ceramics
Nanomaterials
Biomedical materials
Optical materials
Composites
Natural Materials.