Measuring Ti-7Al slip system strengths at elevated temperature using high-energy X-ray diffraction

SCRIPTA MATERIALIA

卷:142

Article

Pagan, Darren C.¹  Bernier, Joel V.²  Dale, Darren¹  Ko, J. Y. Peter¹  Turner, Todd J.³  Blank, Basil⁴  Shade, Paul A.³ 

[1] Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA USA

[3] Air Force Res Lab, Wright Patterson AFB, OH USA

[4] Pulse Ray Inc, Beaver Dams, NY USA

关键词: Titanium;    X-ray Diffraction;    Slip System;    Crystal Plasticity;   

DOI  :  10.1016/j.scriptamat.2017.08.029

来源: Elsevier

【 摘 要 】

Full stress tensors of over four hundred individual grains in a titanium alloy specimen (Ti-7Al) are tracked during continuous uniaxial deformation through the elasto-plastic transition at 355 degrees C. The experiment is facilitated by a unique radiative heating furnace and load frame designed for in-situ high-energy X-ray diffraction measurements. Average strengths of multiple slip system families are calculated directly from the ensemble grain stress data. Results show that elevated temperature lowers the strength of basal slip systems relative to prismatic slip systems, reduces the degree of flow softening due to precipitate shearing, and decreases the first-order pyramidal slip system work-hardening rate. Published by Elsevier Ltd.

【 授权许可】

Free