| 高压扭转变形Mg-Zn-Y合金的组织演化和时效行为 |
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| 引用本文： | 王金辉,尹晓明,李彦生,渠成,徐瑞. 高压扭转变形Mg-Zn-Y合金的组织演化和时效行为[J]. 金属热处理, 2021, 46(1): 167-172. DOI: 10.13251/j.issn.0254-6051.2021.01.031 |
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| 作者姓名： | 王金辉 尹晓明 李彦生 渠成 徐瑞 |
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| 作者单位： | 燕山大学 材料科学与工程学院 亚稳材料制备技术与科学国家重点实验室 河北省金属产品工艺与性能综合优化实验室,河北 秦皇岛 066004 |
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| 摘 要： | 采用透射电镜(TEM)、扫描电镜(SEM)、X射线衍射(XRD)仪和显微硬度计研究了高压扭转(HPT)变形Mg-Zn-Y合金的微观组织演变和时效行为.结果表明,在HPT变形前后,合金中的第二相颗粒是W相和Mg24Y5相,且在HPT处理后没有观察到任何新沉淀物的形成,说明HPT变形并未导致合金发生相变.同时,发现HPT变...
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| 关 键 词： | 镁合金 高压扭转(HPT) 微观组织 析出相 孪晶 |
| 收稿时间： | 2020-06-29 |
Microstructure evolution and aging behavior of Mg-Zn-Y alloy processed by high pressure torsion |
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| Wang Jinhui,Yin Xiaoming,Li Yansheng,Qu Cheng,Xu Rui. Microstructure evolution and aging behavior of Mg-Zn-Y alloy processed by high pressure torsion[J]. Heat Treatment of Metals, 2021, 46(1): 167-172. DOI: 10.13251/j.issn.0254-6051.2021.01.031 |
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| Authors: | Wang Jinhui Yin Xiaoming Li Yansheng Qu Cheng Xu Rui |
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| Affiliation: | State Key Laboratory of Metastable Materials Science & Technology,Hebei Key Lab of for Optimizing Metal Product Technology and Performance,College of Materials Science and Engineering,Yanshan University,Qinhuangdao Hebei 066004,China |
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| Abstract: | Microstructure evolution and aging behavior of high-pressure torsion(HPT)deformed Mg-Zn-Y alloy were studied by using transmission electron microscope(TEM),scanning electron microscope(SEM),X-ray diffraction(XRD)instrument and microhardness tester.The results show that before and after HPT deformation,the second phase particles in the alloy are W phase and Mg24Y5 phase,and the formation of any new precipitates is not observed after HPT processing,indicating that HPT deformation does not lead to phase transformation of the alloy.At the same time,it is found that the HPT deformation process is accompanied by the generation of deformation twins and the multiplication of a large number of dislocations.The deformation twins are subdivided by the second phase particles during the HPT process.Compared with undeformed alloys,HPT deformation can accelerate the aging process,that is,reach a relatively high peak hardness under a shorter aging time.The specimens after HPT deformed 7 turns of are aged at 175℃ for 8 h,the peak microhardness reaches about 114 HV0.1.After aging treatment,the precipitated phase preferentially nucleates at the dislocations and twin boundary,indicating that dislocations and twin boundary act as preferential nucleation sites for the precipitated phases. |
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| Keywords: | magnesium alloy high pressure torsion(HPT) microstructure precipitated phases twin |
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