Influence of Mn addition on the microstructure and mechanical properties of a directionally solidified γ-TiAl alloy
Influence of Mn addition on the microstructure and mechanical properties of a directionally solidified γ-TiAl alloy
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添加Mn对定向凝固γ-TiAl合金显微组织和力学性能的影响
DOI：
10.1016/j.matchar.2018.01.029
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发表时间：
2018-03
影响因子：
4.7
通讯作者：
Hengzhi Fu
中科院分区：
文献类型：
--
作者：
Qiang Wang;Hongsheng Ding;Hailong Zhang;Ruirun Chen;Jingjie Guo;Hengzhi Fu
采用电磁冷坩埚定向凝固技术制备了名义成分为Ti-47 Al-2Nb-2Cr-（0，1，3，5）Mn的TiAl合金，研究了Mn对合金显微组织和力学性能的影响。实验结果表明，Mn原子在TiAl合金中固溶，没有形成Mn化合物。基于X射线衍射（XRD）分析结果，含Mn样品的峰角向更高的值移动，表明晶格收缩。Mn的添加也增加了B2相的体积分数。TiAl合金的屈服强度随着替代溶质Mn原子含量的增加而单调增加。含1at.%，3原子%，和5at.% Mn因此降低，因为在室温变形期间在B2相中优先形成微裂纹。置换溶质Mn原子的引入降低了γ相的层错能，有利于在塑性变形过程的中间阶段进行孪晶控制的塑性变形。形变孪晶与可动位错的相互作用导致了加工硬化率的持续增加。
TiAl alloys with nominal compositions of Ti-47Al-2Nb-2Cr-(0, 1, 3, 5)Mn were prepared via electromagnetic cold crucible directional solidification (ECCDS), and the influence of Mn addition on the microstructure and mechanical properties of the alloys was investigated. The experimental results showed that the Mn atoms were dissolved within the TiAl alloy, and no Mn compounds were formed. Based on the X-ray diffraction (XRD) analysis results, the peak angle of the Mn-containing sample shifted to a higher value, indicating lattice shrinkage. The Mn addition also increased the volume fraction of the B2 phase. The yield strength of the TiAl alloy monotonically increased as the content of the substitutional-solute Mn atoms increased. The ultimate strengths of the TiAl alloys containing 1 at.%, 3 at.%, and 5 at.% Mn consequently decreased because micro-cracks were preferentially formed in the B2 phase during room-temperature deformation. The introduction of substitutional-solute Mn atoms could result in a reduction of the stacking-fault energy of the γ phase, and facilitate the operation of twinning-controlled plastic-deformation during the intermediate stage of the plastic deformation process. The interaction between the deformation twins and movable dislocations led to a continuous increase in the work-hardening rate.
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了解碳原子对高 Nb 含 TiAl 合金微观结构和相变的作用
影响因子：
4.7
作者：
Wu Zeen;Hu Rui;Zhang Tiebang;Zhang Fan;Kou Hongchao;Li Jinshan
通讯作者：
Li Jinshan
影响因子：
3
作者：
H. Ding;Ruirun Chen;Jingjie Guo;Weisheng Bi;Daming Xu;H. Fu
通讯作者：
H. Ding;Ruirun Chen;Jingjie Guo;Weisheng Bi;Daming Xu;H. Fu
DOI：
10.1007/bf03220745
发表时间：
1994-07-01
期刊：
JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY
影响因子：
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作者：
KIM, YW
通讯作者：
KIM, YW
DOI：
10.1016/j.jeurceramsoc.2012.11.006
发表时间：
2013-05-01
影响因子：
5.7
作者：
Zhang, Huarui;Tang, Xiaoxia;Zhang, Shaowei
通讯作者：
Zhang, Shaowei
影响因子：
2.7
作者：
HANAMURA, T;UEMORI, R;TANINO, M
通讯作者：
TANINO, M