PART XI – November 1967 - Communications - Discussion of "Deformation Mechanisms in Titanium at Low Temperatures" *
- Organization:
- The American Institute of Mining, Metallurgical, and Petroleum Engineers
- Pages:
- 3
- File Size:
- 800 KB
- Publication Date:
- Jan 1, 1968
Abstract
Recently Levine applied the Conrad-Wiedersich17 equation where H is the activation enthalpy, v the activation volume, T* the effective shear flow stress, T the absolute temperature, and ? the strain rate, to an analysis of titanium single-crystal data. The activation energy as a function of testing temperaturs obtained from specimens oriented for single (1010) prismatic slip is shown in Fig. 12. This diagram indicates a different linear dependence of H on T in the temperature interval from 220° to 300°K than from 0° to 220°K. Levine interpreted the break in this curve as indicating a change in the thermally activated mechanism controlling the flow stress. The purpose of this communication is to point out that the data in Fig. 1 is not consistent with the concept of a flow stress controlled by a simple thermally activated mechanism between 220° and 300°K. The Conrad-Wiedersich relation assumed that the strain rate can be expressed by:
Citation
APA: (1968) PART XI – November 1967 - Communications - Discussion of "Deformation Mechanisms in Titanium at Low Temperatures" *
MLA: PART XI – November 1967 - Communications - Discussion of "Deformation Mechanisms in Titanium at Low Temperatures" *. The American Institute of Mining, Metallurgical, and Petroleum Engineers, 1968.