**5. Conclusions**

The deformation mechanisms of the low modulus Ti36Nb5Zr alloy were investigated by in situ SXRD experiments. The following conclusions can be drawn:


**Author Contributions:** Conceptualization, Q.M. and X.Z.; methodology, Q.M.; validation, J.Q. and F.W.; formal analysis, K.W.; investigation, H.L.; resources, Y.S. and B.S.; data curation, H.L.; writing—original draft preparation, H.L.; writing—review and editing, Q.M. and X.Z.; visualization, H.L.; supervision, X.Z.; project administration, S.G.; funding acquisition, Q.M. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Fundamental Research Funds for the Central Universities, gran<sup>t</sup> number 2017QNA04.

**Acknowledgments:** Qingkun Meng thanks Cun Yu for technical assistance in the in situ synchrotron experiments, and Junsong Zhang for helpful discussions on the deformation mechanisms. The use of the Advanced Photon Source was supported by the U.S. Department of Energy, O ffice of Science, and O ffice of Basic Energy Science under Contract No. DE-AC02-06CH11357.

**Conflicts of Interest:** The authors declare no conflict of interest.
