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Journal of Phase Equilibria and Diffusion

, Volume 39, Issue 5, pp 702–713 | Cite as

Experimental Diffusion Research on BCC Ti-Mn Binary and Ti-Al‐Mn Ternary Alloys

  • Xiang Huang
  • Junyi Tan
  • Yanhua Guo
  • Guanglong Xu
  • Yuwen Cui
Article
  • 133 Downloads

Abstract

Interdiffusion in the BCC phase of the Ti-Mn binary and Ti-Al-Mn ternary systems was investigated between 1273 and 1473 K by applying the diffusion-couple technique. The local chemical compositions within the interdiffusion zone of the diffusion couples were acquired by electron probe microanalysis (EPMA). The raw composition profiles were then analytically represented by the error function expansion, which allow the ternary inter- and impurity diffusivities to be appropriately extracted by the Whittle–Green and generalized Hall methods, respectively. It was demonstrated that, all four diffusion coefficients \(\mathop {\tilde{D}}\nolimits_{ij}^{k}\) (i, j = Al, Mn), both main and cross ones, increase with increasing the composition of diffusing specie at 1473 K, whereas at 1273 K \(\mathop {\tilde{D}}\nolimits_{\text{MnMn}}^{\text{Ti}}\) and \(\mathop {\tilde{D}}\nolimits_{\text{MnAl}}^{\text{Ti}}\) are enhanced by the addition of diffusing specie Mn but \(\mathop {\tilde{D}}\nolimits_{\text{AlAl}}^{\text{Ti}}\) and \(\mathop {\tilde{D}}\nolimits_{\text{AlMn}}^{\text{Ti}}\) are in weak dependence with the Al content. A complete comparison among seven Ti-Al-X (Ni, Co, Fe, Mn, Cr, V and Mo) ternary systems reveals that the order of the average main interdiffusion coefficients \(\overline{{\mathop {\tilde{D}}\nolimits_{\text{XX}}^{\text{Ti}} }}\) (X = Ni, Co, Fe, Mn, Cr, V and Mo) exhibits DNi > DCo > DFe > DMn > DCr > DV > DMo.

Keywords

BCC phase generalized Hall method impurity diffusivity interdiffusion Ti-Al-Mn ternary Ti-Mn binary Whittle–Green method 

Notes

Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 51571113) and Joint Project of Industry-University-Research of Jiangsu Province (Grant No: BY2016005-02). YG would like to thank the support from the National Natural Science Foundation of China (No. 11647162) and Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD). GX wishes to gratefully acknowledge the financial support by the National Natural Science Foundation of China (No. 51701094) and the Natural Science Foundation of Jiangsu Province (BK20171014).

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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Tech Institute for Advanced Materials and School of Materials Science and EngineeringNanjing Tech UniversityNanjingPeople’s Republic of China
  2. 2.ICMA Instituto de Ciencia de Materiales de AragónSaragossaSpain

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