הי נעם,

אנא שלח אליי קבצי ה-word הבאים:

המאמר שהוגש

מכתב התשובה לעורך שהוגש

קובץ Highlight שהוגש.

תודה.

בברכה,

נסים

Hi Nissim,

Thank you, got it.

Best,

Noam

Hi Noam,

Enclosed pls find:

1. Revised MS2 file (for your convenience, additional references are added as a comment).
2. Revised Highlight file.
3. Respond letter to the editor.

I am available for any question.

Thank you and best wishes,

Nissim

Good morning,

I will take care of most of the issues and send you a respond draft for comments.

Noam,
Pls refer me to the references on amorphization that you mentioned and take a second look on our TEM results.

All the best,

Nissim

Dear all,

Indeed favorable reviews.

All our SEM/TEM data are given in our first paper.

Morphology is also given in our first paper.

The comments regarding DSC are reasonable.

The source for broaden peaks are usually due to:

1. Micro strain – we showed in our first paper that the micro strains are small.
2. Broaden composition of the hydrides (although wasn’t raised by the reviewer…)
3. Nano crystals.

Both 2 and 3 cannot be easily ruled out, so we need to think how/if we can distinguish between both. About domain size from SEM, lets discuss it tomorrow.

All the best,

Nissim

Brian,

Unfortunately, I do not recall having relevant TEM data.

Nissim: please correct me if I forgot anything.

We do have quite a bit of SEM images.

Nissim: Will you be able to run images analysis to determine the “domain” size?

Best,

Noam

From: Brian Rosen <brian.ashley.rosen@gmail.com>
Sent: יום א 23 מאי 2021 21:20
To: Noam Eliaz <neliaz@tauex.tau.ac.il>
Cc: Nissim Navi <nisnavi@gmail.com>; Eyal Sabatani <eyal.sabatani@gmail.com>
Subject: Re: FW: Your Submission - HE-D-21-01254

Hi,

See attached, two reviews. I suggest that we try to submit a revisions with response to reviewers ASAP, before receiving more reviews...J

Best,

Noam

-----Original Message-----
From: em.he.2196.737d0e.5d8a53e6@editorialmanager.com <em.he.2196.737d0e.5d8a53e6@editorialmanager.com> On Behalf Of Ivan Tolj
Sent: יום א 23 מאי 2021 16:44
To: Noam Eliaz <neliaz@tau.ac.il>
Subject: Your Submission - HE-D-21-01254

Manuscript Number:  HE-D-21-01254

Title: Thermal Decomposition of Titanium Hydrides in Electrochemically Hydrogenated Electron Beam Melting (EBM) and Wrought Ti–6Al–4V Alloys Using in situ High-Temperature X-Ray Diffraction Article Type: Full Length Article International Journal of Hydrogen Energy

Dear Professor Eliaz,

I am pleased to inform you that your manuscript received positive feedback from the reviewers. However, the reviewers have indicated that the manuscript needs to be improved according to the recommendations given below before publication.

Additionally your literature survey needs improvement; please expand it. Additional related papers can be found in the International Journal of Hydrogen Energy (IJHE), as well as in other energy and fuel cells related publications.

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---------------------------------------

Reviewers' comments:

%ATTACH_FOR_REVIEWER_DEEP_LINK INSTRUCTIONS%

Reviewer #1: The manuscript presents results of comparative experimental studies of electron-beam melted and conventionally made ("wrought") Ti-6Al-4V alloy after electrochemical hydrogenation, as respect to their phase composition, morphology and characteristics of hydrogen thermodesorption. It was shown that thermal decomposition of the <Delta>-hydrides formed in the two types of hydrogenated Ti-6Al-4V alloy follows two different mechanisms, and the electron-beam melted alloy is more prone to hydrogen damage at elevated temperatures than its "wrought" counterpart. The origins of the observed effects were related to differences of morphologies of the two studied types of Ti-6Al-4V.

Results of the present study are valuable for the researchers, engineers and technologists involved in development and application of advanced Ti-based alloys as regards to their tolerance to hydrogen "corrosion" and are worth to be published in International Journal of Hydrogen Energy. Some reviewer's comments to be addressed during revision are the following:

1.            First highlight is too long (should be up to 85 characters including spaces)

2.            There is some inconsistency between highlights referring to "AM'ed" (prepared by additive manufacturing) and other text of the manuscript referring to "EBM'ed" (prepared by electron beam melting) alloy.

3.            Some clarification about additive manufacturing and conventional ("wrought") methods of the preparation of Ti-6Al-4V alloys would be useful for readers who are not narrow specialists in the metallurgy of Ti alloys.

4.            It also makes sense to present (either in the main text, or in supplementary information) the data illustrating morphology of the two studied samples.

5.            The sentence in first paragraph on page 4 "TiH2 was found to start releasing hydrogen at 375 °C under Ar flow and a heating rate of 10 °C/min, followed by lattice parameter expansion [39]" needs further clarification. According to ref [39], the origin of lattice expansion is thermal expansion not associated with hydrogen release. However, with every peak of H2 release, the lattice contracts.

6.            Page 3, end of the first paragraph "When the heating rate was increased, a shifted was evident…" - "shifted" seems to be typo, should be "shift"

Reviewer #2: This article investigated the thermal stability of titanium hydrides synthesized by two different methods. Given the importance of titanium alloys in many industrial applications, this study assesses the importance of interstitial hydrogen on the properties of these alloys. First of all, the English language is quite good and requires minor revision in the introduction section where some typos exist. The research background is well covered, and the objective is clear. The "materials and methods" section is sound. However, I have some comments on the results.

1.            Please mention the heating rate for the DSC graph in Fig.1;  the interpretation of the thermograms of the non-hydrogenated sample is not correct. The broad endothermic effect observed at 550 oC is not well observable. I think this is still the baseline of the DSC signal. And if the authors believe it is a phase transition, they should add the DSC baseline and these thermograms to help the readers.

2.            From this Fig.1, what is the thermogravimetric effect of these alloys (i.e. hydrogen weight percent wt.%)?

3.            Fig.2 shows the XRD of the samples. Why these XRD peaks are so broad, is it because the samples are nano-crystallines? And if so, during the Rietveld analysis, can the authors provide us with the grain size with the phase aboundance given in Fig.3 ?

4.            In conclusion, the authors chose to hydrogenate these titanium alloys electrochemically for 4 days. The justification of selecting 4 days was not given. what is the effect of days on the hydrogenation performance, especially the H2 wt%, which was not given in this study?

****

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