ni-mn-sn-co合金固溶处理态的sem形貌和成分分析.doc
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ni-mn-sn-co合金固溶处理态的sem形貌和成分分析,摘 要本文采用光学显微镜、扫描电镜、x射线衍射、差示扫描量热仪和室温压缩试验等研究了co元素对ni-mn-sn合金的组织结构、马氏体相变行为和力学性能等的影响，探讨co掺杂对ni-mn-sn合金相变行为和力学行为的影响规律。 试验结果表明，co掺杂显著改变了ni-mn-sn合金的显微组织，在合金基体上形成了富co相；n...
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摘 要
本文采用光学显微镜、扫描电镜、X射线衍射、差示扫描量热仪和室温压缩试验等研究了Co元素对Ni-Mn-Sn合金的组织结构、马氏体相变行为和力学性能等的影响，探讨Co掺杂对Ni-Mn-Sn合金相变行为和力学行为的影响规律。
试验结果表明，Co掺杂显著改变了Ni-Mn-Sn合金的显微组织，在合金基体上形成了富Co相；Ni50Mn37Sn13合金的显微组织为单一固溶体，加Co后合金室温下的显微组织由基体相和富Co相组成；Co的加入不仅能够明显细化Ni-Mn-Sn合金的晶粒尺寸，还抑制了热处理过程中合金晶粒的长大。
在冷却和加热过程中Ni-Mn-Sn-Co合金只发生一步马氏体相变，随着Co含量增加， Ni-Mn-Sn-Co合金的相变温度升高，Co的加入降低了Ni-Mn-Sn合金的相变滞后，但是随Co元素含量变化，相变滞后度基本保持不变。随Co含量增加，Ni-Mn-Sn-Co合金中马氏体的晶体结构由10M转化为14M结构。
压缩试验表明，Co掺杂显著提高了合金的断裂应力和断裂应变。随Co含量增多，合金的断裂应力和断裂应变均呈增大趋势。合金的断口形貌表明，随Co含量提高，合金的断裂方式从典型的沿晶脆断逐渐转变为滑移分离性延性断裂，说明合金韧性得到了显著的改善。
关键词：Ni-Mn-Sn-Co合金；磁性形状记忆合金；显微组织；马氏体相变；
力学性能
Abstract
The characteristics of martensite transformation，microstructure of Ni-Mn-Sn alloys were investigated by means of optical microscope，SEM，XRD，DSC as well as compression test at room temperature. The influence of Co dopping on the phase transformation behavior and mechanical properties was studied.
The experimental results show that the microstructure of Ni-Mn-Sn alloy is obviously changed by Co addition, and there are Co-rich phases formed in the matrix of Ni-Mn-Sn alloy. The microstructure of Ni50Mn37Sn13 alloy is single solution, however the Co-rich phase and the matrix consists of the microstructure of Ni-Mn-Sn-Co alloy. Co addition not only refines the grain size of Ni-Mn-Sn alloy evidently but also retards the grain growth during heat treatment process.
Ni-Mn-Sn-Co alloy exhibits one-step martensitic transformation during the process of cooling and heating. With Co content increasing, the martensitic transformation temperatures increase while the hysistersis decreases. The crystal structure of martensite of Ni-Mn-Sn-Co alloy is changed from 10M to 14M with the increase of Co content.
Compression test results show that Co addition improves the mechanical properties. The compressive strength and compressive strain of Ni-Mn-Sn alloy both invreases with Co content increasing. The fracture type of Ni-Mn-Sn changes from intergranular crack to gliding separated ductile fracture with Co addition, which indicates the improvement of ductility.
Keywords：Ni-Mn-Sn-Co alloy, Magnetic shape memory alloy, Microstructure, Martensitic transformation, Mechanical behavior
目 录
摘 要 I
Abstract II
第1章 绪论 1
1.1 引言 1
1.2 形状记忆合金分类 2
1.2.1 传统温控记忆合金 2
1.2.2 新型磁驱动记忆合金 3
1.3 Ni-Mn-Sn合金的晶体结构 5
1.4 选题意义和研究内容 7
1.4.1 选题意义 7
1.4.2 主要研究内容 8
第2章 材料制备和实验方法 9
2.1 Ni-Mn-Sn-Co材料制备及热处理 9
2.2 组织性能 10
2.2.1 金相组织观察 10
2.2.2 扫描电镜分析 10
2.2.3 X射线衍射分析 10
2.3 相变温度测试 11
2.4 力学性能测试 11
第3章 Ni-Mn-Sn-Co合金的显微组织 12
3.1 引言 12
3.2 Ni-Mn-Sn-Co合金的显微组织 12
3.2.1 铸态Ni50Mn37Sn13-xCox合金的显微组织 12
3.2.2 热处理后Ni50Mn37Sn13-xCox合金的显微组织 12
3.2.3 Ni-Mn-Sn-Co合金固溶处理态的SEM形貌和成分分析 14
3.3 本章小结 17
第4章 Ni-Mn-Sn-Co合金的马氏体相变 18
4.1 引言 18
4.2 Ni-Mn-Sn-Co合金的晶体结构 18
4.3 Ni-Mn-Sn-Co合金的马氏体相变 20
4.4 本章小结 25
第5章 Ni-Mn-Sn-Co合金的力学行为 26
5.1 引言 26
5.2 Ni-Mn-Sn-Co合金的压缩变形行为 26
5.3 Ni-Mn-Sn-Co合金断口组织观察 30
5.4 本章小结 31
结 论 32
致 谢 33
参考文献 34
附录1 36
附录2 41
本文采用光学显微镜、扫描电镜、X射线衍射、差示扫描量热仪和室温压缩试验等研究了Co元素对Ni-Mn-Sn合金的组织结构、马氏体相变行为和力学性能等的影响，探讨Co掺杂对Ni-Mn-Sn合金相变行为和力学行为的影响规律。
试验结果表明，Co掺杂显著改变了Ni-Mn-Sn合金的显微组织，在合金基体上形成了富Co相；Ni50Mn37Sn13合金的显微组织为单一固溶体，加Co后合金室温下的显微组织由基体相和富Co相组成；Co的加入不仅能够明显细化Ni-Mn-Sn合金的晶粒尺寸，还抑制了热处理过程中合金晶粒的长大。
在冷却和加热过程中Ni-Mn-Sn-Co合金只发生一步马氏体相变，随着Co含量增加， Ni-Mn-Sn-Co合金的相变温度升高，Co的加入降低了Ni-Mn-Sn合金的相变滞后，但是随Co元素含量变化，相变滞后度基本保持不变。随Co含量增加，Ni-Mn-Sn-Co合金中马氏体的晶体结构由10M转化为14M结构。
压缩试验表明，Co掺杂显著提高了合金的断裂应力和断裂应变。随Co含量增多，合金的断裂应力和断裂应变均呈增大趋势。合金的断口形貌表明，随Co含量提高，合金的断裂方式从典型的沿晶脆断逐渐转变为滑移分离性延性断裂，说明合金韧性得到了显著的改善。
关键词：Ni-Mn-Sn-Co合金；磁性形状记忆合金；显微组织；马氏体相变；
力学性能
Abstract
The characteristics of martensite transformation，microstructure of Ni-Mn-Sn alloys were investigated by means of optical microscope，SEM，XRD，DSC as well as compression test at room temperature. The influence of Co dopping on the phase transformation behavior and mechanical properties was studied.
The experimental results show that the microstructure of Ni-Mn-Sn alloy is obviously changed by Co addition, and there are Co-rich phases formed in the matrix of Ni-Mn-Sn alloy. The microstructure of Ni50Mn37Sn13 alloy is single solution, however the Co-rich phase and the matrix consists of the microstructure of Ni-Mn-Sn-Co alloy. Co addition not only refines the grain size of Ni-Mn-Sn alloy evidently but also retards the grain growth during heat treatment process.
Ni-Mn-Sn-Co alloy exhibits one-step martensitic transformation during the process of cooling and heating. With Co content increasing, the martensitic transformation temperatures increase while the hysistersis decreases. The crystal structure of martensite of Ni-Mn-Sn-Co alloy is changed from 10M to 14M with the increase of Co content.
Compression test results show that Co addition improves the mechanical properties. The compressive strength and compressive strain of Ni-Mn-Sn alloy both invreases with Co content increasing. The fracture type of Ni-Mn-Sn changes from intergranular crack to gliding separated ductile fracture with Co addition, which indicates the improvement of ductility.
Keywords：Ni-Mn-Sn-Co alloy, Magnetic shape memory alloy, Microstructure, Martensitic transformation, Mechanical behavior
目 录
摘 要 I
Abstract II
第1章 绪论 1
1.1 引言 1
1.2 形状记忆合金分类 2
1.2.1 传统温控记忆合金 2
1.2.2 新型磁驱动记忆合金 3
1.3 Ni-Mn-Sn合金的晶体结构 5
1.4 选题意义和研究内容 7
1.4.1 选题意义 7
1.4.2 主要研究内容 8
第2章 材料制备和实验方法 9
2.1 Ni-Mn-Sn-Co材料制备及热处理 9
2.2 组织性能 10
2.2.1 金相组织观察 10
2.2.2 扫描电镜分析 10
2.2.3 X射线衍射分析 10
2.3 相变温度测试 11
2.4 力学性能测试 11
第3章 Ni-Mn-Sn-Co合金的显微组织 12
3.1 引言 12
3.2 Ni-Mn-Sn-Co合金的显微组织 12
3.2.1 铸态Ni50Mn37Sn13-xCox合金的显微组织 12
3.2.2 热处理后Ni50Mn37Sn13-xCox合金的显微组织 12
3.2.3 Ni-Mn-Sn-Co合金固溶处理态的SEM形貌和成分分析 14
3.3 本章小结 17
第4章 Ni-Mn-Sn-Co合金的马氏体相变 18
4.1 引言 18
4.2 Ni-Mn-Sn-Co合金的晶体结构 18
4.3 Ni-Mn-Sn-Co合金的马氏体相变 20
4.4 本章小结 25
第5章 Ni-Mn-Sn-Co合金的力学行为 26
5.1 引言 26
5.2 Ni-Mn-Sn-Co合金的压缩变形行为 26
5.3 Ni-Mn-Sn-Co合金断口组织观察 30
5.4 本章小结 31
结 论 32
致 谢 33
参考文献 34
附录1 36
附录2 41
