Microstructure, Mechanical Property, and Wear Behavior of NiAl-Based High-Entropy Alloy

Round 1

Reviewer 1 Report

The paper "Microstructure, mechanical property and wear behavior of NiAl-based high entropy alloy" presents important aspects of HEA alloys in terms of microstructure analysis and mechanical properties. It can be published just after some minor corrections:

1. The introduction should be updated with more research presenting the values of mechanical properties like hardness or tensile strength. Also, a better explanation of the influence of Ni and Al in the usage properties Suggested reference: 10.37358/rc.18.4.6203

2. Line 72: Add SEM and XRD parameters

3. Figure 1 and 5: Add ICDD file codes

4. Figure 7: Add error bars; how many determiantions have been performed?

5. Revise the number of chapters.

 

The rest is fine.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

In this work the authors study the microstructure, mechanical and wear properties of a NiAl based high-entropy alloy fabricated by vacuum arc melting. You may find my comments and suggestions below:

1) What was the size of the fabricated ingot?

2) What was the solidification rate of the fabrication process?

3) How did you conduct the XRD testing of the specimens after compression? Were the specimens flat after deformation?

4) Add a table with the exact chemical composition of the HEA.

5) Compare the mechanical properties, hardness and wear performance of the studied HEA with other widely studied HEAs/alloys such as CoCrFeMnNi, AlCoCrFeNi, 316 SS.

6) Expand the discussion on the different strengthening mechanisms of the NiAl based HEA.

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

Article is well written. Consider the following few points to attract the reader's attention and improve the article.

Comments for author File: Comments.pdf

Minor editing of English language required

Author Response

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Author Response File: Author Response.pdf

Reviewer 4 Report

Reviewer comments

I would like to introduce all my thanks for editors of Coatings journal. The purpose of this research is to design suitable high entropy alloy to form a balance between the strength and plasticity of single-phase HEAs.

Comments of authors

1- The English language needs an improvement

2- Please explain in the introduction part with suitable references (the high mixing entropy of HEAs tends to form single- phase solid Solution.) (What are the conditions suitable for achieving single- phase solid Solution?

3- Please (tends not tend) (the high mixing entropy of HEAs tend to form single- phase solid Solution. There are others.

4- Please explain this facts (the combination of HEAs with good strength and ductility can also be obtained by introducing nano-precipitation.) (introduction)

5- Suggested related reference

·        Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique, Crystals 2021, 11(5), 540; https://doi.org/10.3390/cryst11050540

6- Please explain, how could you determine the chemical composition of the suggested HEA?

7- What is the weight percentages of the Al in the NiAl?

8- Please insert an image for the prepared ant tested samples.

9- Please define used abbreviations

10- Please explain in the discussion (the wear coefficient decreases with the increase of temperature in the range of room temperature to 400℃.)

11- Please explain (over the 100 ^oC, the wear mechanism is mainly abrasive wear.)

12- Please improve the used image quality.

13- Do the COF values refer to the mean?

 

14- Please review the conclusion.

Comments for author File: Comments.pdf

Minor editing of the English language required

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

Comments have been addressed as per the suggestion. Now article is substantially improved 

Minor spell check required 

Reviewer 4 Report

Comments have been answered 

Minor editing of English language required