Anisotropy of the Microstructure and Tensile Properties in Ti-5Al-5Mo-5V-1Cr-1Fe near β Titanium Alloy during Hot Rolling and Heat Treatment
Round 1
Reviewer 1 Report
This work addresses the effect hot rolling and heat treatment on microstrcutures and mechanical properties of Ti55511 alloy. This study shows interesting results and discussion. It can be considered for publication after addressing the following comments:
- Considering Fig. 2: Please explain why elastic modulus values are very different but yield strengths and ultimate strengths are close to each other?
- Why XRD was not carried out to investigate the resulting phases?
- Please extend the literature review and explain more on importance and significance of titanium-based materials for varied applications. Please see and use these two works: International Journal of Machine Tools and Manufacture 133 (2018) 85-102 and Materials Science and Engineering: A 593 (2014) 170-177.
Author Response
Reviewer #1
Comment 1. Considering Fig. 2: Please explain why elastic modulus values are very different but yield strengths and ultimate strengths are close to each other?
Response 1: The size of tensile specimens is so small and we didn’t use an extensometer which has no influence on the yield strengths and ultimate strengths. From the engineering stress-strain curves, elastic modulus values seem to be inaccurate. Besides, elastic modulus values are not our main research contents and doesn’t affect our results. Yield strengths and ultimate strengths are close to each other, and it belongs to a normal phenomenon. Similar results can be found in other papers, for example:
* Huang, C.W.; Zhao, Y.Q.; Xin, S.W.; et al. Effect of microstructure on tensile properties of Ti-5Al-5Mo-5V-3Cr-1Zr alloy. J. Alloy. Compd. 2017, 693, 582-591.
*Ye, X.X.; Yang, Y.Y.; Song, G.L.; et al. Enhancement of ductility, weakening of anisotropy behavior and local recrystallization in cold-rolled Ti-6Al-4V alloy strips by high-density electropulsing treatment. Appl. Phys. A. 2014, 117, 2251-2262.
Comments 2. Why XRD was not carried out to investigate the resulting phases?
Response 2: We think that the XRD experiment is not necessary. Two usual phases: α phase and β phase are easily identified. Consider that the temperature of rolling and heat treatment are highly over the existent temperature of ω phase, so we thought there is no ω phase. We have already used TEM observation to investigate other martensite phase and didn’t put this result in this paper. In addition, Bruker D8 Discover XRD detector was used to acquire pole figures of α and β phases.
Comment 3: Please extend the literature review and explain more on importance and significance of titanium-based materials for varied applications. Please see and use these two works: International Journal of Machine Tools and Manufacture 133 (2018) 85-102 and Materials Science and Engineering: A 593 (2014) 170-177.
Response 3: We have taken your advice about extending the literature review into consideration. Consider that the original content is too narrow, We have already partly revised the Introduction.
Reviewer 2 Report
Manuscript presented deals with Ti-based alloys improved by mechanical rolling. The manuscript is well written, well organised, several complementary techniques were used. I think that potentially the topic should be interesting for the community and relevant for the broad audience.
I suggest to rephrase a titel: "Anositropy about..." seems for me quite unreadable.
Line 43: low simmetry of hcp structured alloys has no meaning, while according to crystallographical definitions both fcc and hcp has highest possible simmetry, as well as interatomic distances in hcp structure are equial.
Author Response
Reviewer #2
Comment 1: I suggest to rephrase a title: "Anisotropy about..." seems for me quite unreadable.
Response 1: It’s an error. We realize that the original expression is unreadable. So we slightly change the title, and the new title is as following: Anisotropy of the Microstructure and Tensile Properties in Ti-5Al-5Mo-5V-1Cr-1Fe near β Titanium Alloy During Hot Rolling and Heat Treatment.
Comment 2: Line 43: low symmetry of hcp structured alloys has no meaning, while according to crystallographical definitions both fcc and hcp has highest possible symmetry, as well as interatomic distances in hcp structure are equal.
Response 2: The original expression is not appropriate. To avoid ambiguity for readers, this sentence has been already modified. The new sentence is as following: rolling can easily cause the intense crystallographic texture in α and β phase and further results in the obvious anisotropic mechanical properties in titanium alloys.
Author Response File: 
Author Response.pdf
