Study on the Surface Modification of Nanostructured Ti Alloys and Coarse-Grained Ti Alloys
, Yi-Hong Cheng 1, Guan-Yuan Li 1, Ying-Chi Chen 1, Piotr Bazarnik 2, Jessica Muzy 3, Yi Huang 4,5,* and Terence G. Langdon 5
Round 1
Reviewer 1 Report
The investigations described in the Manuscript are interesting for the scientific and professional community, clearly presented and discussed. My only suggestion is that the authors should correct the lines in Figure 3 and Figure 9, so that the line represents a trend, and not simply connect the dots, and the results (dots) should be presented with the error bar. The error bars should be added to every diagram in the Manuscript.
Author Response
Our response to reviewer's comments is in attached PDF.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This paper examines the changes in grain size with and without HPT processing and the effects of subsequent laser surface texturing, and there is novelty. However, it is difficult to understand the relationship between the experimental results and the effects of HPT processing and surface texturing, so it is desirable to properly discuss the results showing the relationship.
1.
Differences in grain size before and after HPT processing are shown in Figures 1 and 2.
Inferring from Figure 3, the surface roughness and contact angle are aligned, and is it a result showing that the difference in grain size has no effect?
In addition, although the surface hardness is not shown in the experimental results. Does the difference in surface hardness after HPT processing is small at the laser surface texturing?
2.
What is indicated at the vertical trace of cross section on Figure 5? Is there a relationship between surface cracking and laser surface texturing?
3.
After the laser surface texturing in Fig.6, the diffraction peak of β (110) is also seen. What is the effect of this change?
4.
The horizontal axis of Fig.7 is 0-30days, and it is easier to understand if Fig.8 and 9 are also aligned. However, it is difficult to understand the correlation of Fig.7, 8 and 9 and the presence or absence of a significant difference. Please give a comparative statement.
For example,
・Fig.7: Is there a difference between CP-Ti and Ti64 only in the case of O2?
・Fig.8: At O2, it is the same in one day, but there is a difference on the 27th.
At Vac, there is a difference in one day, but it will be the same on the 27th.
・Correlation between Fig.9 and Fig.7 air.
Author Response
Our response to reviewer's comments is in attached PDF.
Author Response File: Author Response.pdf
Reviewer 3 Report
This paper deals with the ¨ Study on the surface modification of nanostructured Ti alloys 2 and coarse-grained Ti alloys¨. The manuscript topic is interesting. However, there are comments for improvements to the paper:
1- The introduction needs to be improved. The benefits and drawbacks of this research are not clear. The authors aimed for what they wanted to present, but they did not mention what kind of problem they wanted to solve.
2- please add the chemical and mechanical properties of the raw material.
3- Please add the HPT machine and setup and laser surface treatment pictures better to understand the process (or schematic figure).
4- please add a picture of where the microstructure analysis has been done.
5- Please add the final product after HPT.
6- The resolution of pictures is low. Please use high-resolution images. Specially Figs. 3 and 4.
7- Discussion needs to improve.
Author Response
Our response to reviewer's comments is in attached PDF.
Author Response File: Author Response.pdf
Reviewer 4 Report
Lin et al paper titled ‘Study on the surface modification of nanostructured Ti alloys and coarse-grained Ti alloys”. The overall presentation of this work is good. The methods and characterization techniques of Ti-6Al-4V alloys were systematically investigated. This is an important and interesting research topics in surface engineering. I recommend this work accepted in this journal after addressing the following minor comments.
Some comments for improvement
- If possible, the authors are requested to provide clear contact angle images for pure Ti alloy and any one modified alloy sample for clear understanding and better comparison of the hydrophobicity of the samples.
- Please requested to cite very recent references related to this work in the introduction.
- Provide space between number & degree Celsius for example 500°C written as 500 °C.
- What is the reason for increased contact angle of laser-treated CP-Ti and Ti64 materials?
- 2%HF + 10%HNO3 + 88%H2O should be written as 2% HF + 10% HNO3 + 88% H2O
Author Response
Our response to reviewer's comments is in attached PDF.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
The content and figures have been improved for the comments.
Reviewer 3 Report
The authors revised the manuscript and answer the comments correctly.
