增材制造异构组织TiAl合金热压缩过程中的显微组织演变及动态再结晶机制
采用热压缩实验、光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)和透射电镜(TEM)研究了电子束选区熔化(SEBM)制备的Ti-48Al-2Cr-2Nb合金(摩尔分数,％)在1150 ℃和0.1 s-1条件下热变形过程中的显微组织演变和动态再结晶(DRX)机制.结果表明:合金的初始显微组织为沿打印方向交替分布的γ粗晶层和γ+α2+(α2/γ)细晶层.热变形初期,粗晶中形成有利于后续变形的变形孪晶,细晶区域发生少量动态再结晶(DRX).随着应变的增加,粗晶区和细晶区通过不同的再结晶机制形成大量的DRX晶粒.其中,细晶区的DRX机制为不连续动态再结晶(DDRX),粗晶区的DRX机...
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| Published in | 中国有色金属学报（英文版） Vol. 34; no. 10; pp. 3208 - 3220 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中南大学材料科学与工程学院,长沙 410083%中南大学材料科学与工程学院,长沙 410083
2024
中南大学有色金属材料科学与工程教育部重点实验室,长沙 410083%中南大学粉末冶金国家重点实验室,长沙 410083%西安赛隆增材技术股份有限公司,西安 710016%香港城市大学材料科学与工程系,香港高等研究院,香港九龙 999077 中南大学粉末冶金国家重点实验室,长沙 410083 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1003-6326 |
| DOI | 10.1016/S1003-6326(24)66603-3 |
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| Abstract | 采用热压缩实验、光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)和透射电镜(TEM)研究了电子束选区熔化(SEBM)制备的Ti-48Al-2Cr-2Nb合金(摩尔分数,％)在1150 ℃和0.1 s-1条件下热变形过程中的显微组织演变和动态再结晶(DRX)机制.结果表明:合金的初始显微组织为沿打印方向交替分布的γ粗晶层和γ+α2+(α2/γ)细晶层.热变形初期,粗晶中形成有利于后续变形的变形孪晶,细晶区域发生少量动态再结晶(DRX).随着应变的增加,粗晶区和细晶区通过不同的再结晶机制形成大量的DRX晶粒.其中,细晶区的DRX机制为不连续动态再结晶(DDRX),粗晶区的DRX机制包括DDRX和连续动态再结晶(CDRX). |
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| AbstractList | 采用热压缩实验、光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)和透射电镜(TEM)研究了电子束选区熔化(SEBM)制备的Ti-48Al-2Cr-2Nb合金(摩尔分数,％)在1150 ℃和0.1 s-1条件下热变形过程中的显微组织演变和动态再结晶(DRX)机制.结果表明:合金的初始显微组织为沿打印方向交替分布的γ粗晶层和γ+α2+(α2/γ)细晶层.热变形初期,粗晶中形成有利于后续变形的变形孪晶,细晶区域发生少量动态再结晶(DRX).随着应变的增加,粗晶区和细晶区通过不同的再结晶机制形成大量的DRX晶粒.其中,细晶区的DRX机制为不连续动态再结晶(DDRX),粗晶区的DRX机制包括DDRX和连续动态再结晶(CDRX). |
| Abstract_FL | Microstructural evolution and dynamic recrystallization(DRX)mechanisms of a Ti-48Al-2Cr-2Nb(at.％)alloy prepared by selective electron beam melting(SEBM)during hot deformation at 1150 ℃ and 0.1 s-1 were investigated by hot compression tests,optical microscope(OM),scanning electron microscope(SEM),electron back-scattered diffraction(EBSD)and transmission electron microscope(TEM).The results show that the initial microstructure of the as-SEBMed alloy exhibits layers of coarse y grains and fine γ+α2+(α2/γ)lamellar mixture grains alternately along the building direction.During the early stage of hot deformation,deformation twins tend to form within the coarse grains,facilitating subsequent deformation,and a small number of DRX grains appear in the fine-grained regions.With the increase of strain,extensive DRX grains are formed through different DRX mechanisms in both coarse and fine-grained regions,involving discontinuous dynamic recrystallization mechanism(DDRX)in the fine-grained regions and a coexistence of DDRX and continuous dynamic recrystallization(CDRX)in the coarse-grained regions. |
| Author | 陶慧 谭孝芬 贺卫卫 梁霄鹏 李慧中 王丽 周睿 李佳慧 |
| AuthorAffiliation | 中南大学材料科学与工程学院,长沙 410083%中南大学材料科学与工程学院,长沙 410083;中南大学粉末冶金国家重点实验室,长沙 410083;中南大学有色金属材料科学与工程教育部重点实验室,长沙 410083%中南大学粉末冶金国家重点实验室,长沙 410083%西安赛隆增材技术股份有限公司,西安 710016%香港城市大学材料科学与工程系,香港高等研究院,香港九龙 999077 |
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| Author_FL | Hui TAO Jia-hui LI Xiao-fen TAN Hui-zhong LI Li WANG Wei-wei HE Rui ZHOU Xiao-peng LIANG |
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| Author_xml | – sequence: 1 fullname: 陶慧 – sequence: 2 fullname: 李慧中 – sequence: 3 fullname: 李佳慧 – sequence: 4 fullname: 王丽 – sequence: 5 fullname: 贺卫卫 – sequence: 6 fullname: 谭孝芬 – sequence: 7 fullname: 周睿 – sequence: 8 fullname: 梁霄鹏 |
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| DocumentTitle_FL | Microstructural evolution and dynamic recrystallization mechanisms of additively manufactured TiAl alloy with heterogeneous micro structure during hot compression |
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| Keywords | 连续动态再结晶 TiAl合金 异构组织 discontinuous dynamic recrystallization(DDRX) 电子束选区熔化 TiAl alloy 不连续动态再结晶 selective electron beam melting heterogeneous microstructure continuous dynamic recrystallization(CDRX) |
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| Title | 增材制造异构组织TiAl合金热压缩过程中的显微组织演变及动态再结晶机制 |
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