The Structural and Phase State of the TiAl System Alloyed with Rare-Earth Metals of the Controlled Composition Synthesized by the “Hydride Technology”

Round 1

Reviewer 1 Report

Please find attached a PDF file with my comments and suggestions for authors.

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

After reading the text I have some comments :

There is a lot of term and literal mistake (or “translation mistake”) which  require correction.

1.Please mark * to corresponding author (line 5)

2. 2. Term Intermetallide aluminum alloys γ-TiAl are not correct. TiAl-based intermetallic alloys belong to titanium group. Instead of intermetallide alloys based on the γ-TiAl Intermetallic alloys based on γ-TiAl is usually used.
3. 3. Resistance to creeping (l.31, 64)– creep resistance and analogical oxidation resistance and burn resistance
4. In chapter Materials and methods there is no information about parameters of “hydride technology” (how authors received research materials?, in what form?). although there is a description of HT method in Introduction, but like a citation of others authors.
5. l. 65- rare instead of rear
6. 6. l.68- (…)on the structure and mechanical properties of γ-TiAl liquid phase ???
7. 7. In table 1-4 alpha instead of alpfa
8. 8. line 3,4 below fig.3 instead of a₂ should be a₂
9. 9. Table 9. Please check a space group of Ti₅Al₁₁ in TAD alloy. Ti₃Al₅ appears 2 times ( lack of Dy (DyAl₂?)
10. 10. line 4 below table 7. 7e ??
11. line 2 below fig.4. sandwich?
12. 12. line 6 below fig.5. fig. 5c instead of 5b
13. 13. line 8 below fig.5. fig. 5c instead of 5c
14. 14. line 1 below tab.9. lack of (fig. 8)
15. 15. Conclusion:

• which leads to the growth of the share of the covalent bond – lack of citation -(the result was not presented)
• (…)they are used as a dispersed phase, and the uniform distribution of tantalum in a titanium-aluminum matrix indicates(…) -the authors not present results confirmed it.

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

The authors have investigated the microstructure and phase evolution of TiAl alloy fabricated by hydride technology. A comprehensive study of phase analysis by Reitveld method was done in this study. Some useful comments are:

1. Some more information, especially, comparison of the hydride technology with existing processing routes can be cited in the introduction section.
2. What is the basis for selecting Ta, Y, Dy? Authors already stated that Ta, Dy are already used in TiAl alloys.
3. Please check the notation alpfa in Table 1-4.
4. Figure 4, are the intermetallic phase thicknesses in the nano range, as shown by ring pattern? Is it a ring or spot pattern? Please check and index the spots.
5. Similarly for figure 6.

Author Response

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Author Response File: Author Response.pdf