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Experimental Investigation of the Mo–Ti–Zr Ternary Phase Diagrams

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Abstract

In this work, the phase diagrams of the Mo–Ti–Zr ternary system were determined by means of X-ray diffraction, optical microscopy, and electron probe microanalysis. Two isothermal sections of the Mo–Ti–Zr ternary system at 900 and 1100 °C were experimentally established. There are three two-phase regions and one three-phase region at both isothermal sections. The existence of the three-phase region (β1 + Laves + β2) at 900 and 1100 °C indicates that the β phase (bcc solid solution) separates into two phases, i.e. Mo, Ti rich solid solution β1 and Ti, Zr rich solid solution β2. No ternary compounds were detected. The maximum solubilities of Ti in the Laves phase were found to be 19.3 at.% at 900 °C and 18.3 at.% at 1100 °C, respectively. The liquidus projection and reaction scheme of the Mo–Ti–Zr system were also presented based on the present experimental work and literature information.

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Acknowledgment

The financial support from the Science Challenge Project of China (Grant No. TZ2016004) is acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, Hunan, People’s Republic of China

    Huaqing Zhang, Yong Du, Shuhong Liu, Jiong Wang & Kun Li

  2. Collaborative Innovation Center of Steel Technology, University of Science and Technology, Beijing, 100083, People’s Republic of China

    Cong Zhang

  3. College of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, People’s Republic of China

    Peng Zhou

  4. College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou, 412008, Hunan, People’s Republic of China

    Yingbiao Peng

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  1. Huaqing Zhang
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Correspondence to Yong Du.

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Fig. S1

Calculated binary phase diagrams: (a) Mo–Ti system [21], (b) Mo–Zr system [22], (c) Ti–Zr system [23] (PDF 614 kb)

Fig. S2

The isothermal sections of the Mo–Ti–Zr system from literature [25-28]: (a) The isothermal sections at 600, 700, 750 and 800 °C; (b) Closer view of the Zr-rich corner from (a) (PDF 964 kb)

Fig. S3

XRD patterns of the representative alloys annealed at 900 °C for 40 days: (a) Sample 1# (Mo-24.8 at.% Zr-39.2 at.% Ti); (b) Sample 4# (Mo-16.8 at.% Zr-28.1 at.% Ti); (c) Sample 8# (Mo-44.4 at.% Zr-23.7 at.% Ti), (d) Sample 11# (Mo-21.6 at.% Zr-52.4 at.% Ti), (e) Sample 12# (Mo-20.9 at.% Zr-56.4 at.% Ti) and Sample 13# (Mo-4.6 at.% Zr-6.8 at.% Ti) (PDF 318 kb)

Fig. S4

XRD patterns of the representative alloys annealed at 1100 °C for 20 days: (a) Sample 2# (Mo-27.3 at.% Zr-37.5 at.% Ti); (b) Sample 4# (Mo-28.9 at.% Zr-15.4 at.% Ti); (c) Sample 8# (Mo-54.2 at.% Zr-15.2 at.% Ti) and (d) Sample 10# (Mo-26.4 at.% Zr-46.5 at.% Ti) (PDF 214 kb)

Fig. S5

XRD patterns of the as-cast alloys (a) Sample 3# (Mo-28.1 at.% Zr-8.4 at.% Ti); (b) Sample 11# (Mo-62.4 at.% Zr-3.6 at.% Ti); (c) Sample 18# (Mo-67.4 at.% Zr-9.8 at.% Ti) (PDF 163 kb)

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Zhang, H., Zhang, C., Zhou, P. et al. Experimental Investigation of the Mo–Ti–Zr Ternary Phase Diagrams. J. Phase Equilib. Diffus. 39, 789–799 (2018). https://doi.org/10.1007/s11669-018-0668-6

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  • DOI: https://doi.org/10.1007/s11669-018-0668-6

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