Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7971600 | Materials Science and Engineering: A | 2018 | 20 Pages |
Abstract
The Portevin-Le Chaterlier (PLC) effect in Ti-12Mo and Ti-15Mo alloys has been investigated by using uniaxial tensile tests in a temperature range of 25-350â¯Â°C with an applied strain rate of the order of 10â3 sâ1, coupled with a digital image correlation (DIC) method. The experimental results show an increase of the yield stress from 25â¯Â°C to 250â¯Â°C followed by a decrease. Moreover, PLC effect occurs above 250â¯Â°C and stress drop magnitude increases while the number of stress drops per unit time decreases with increasing the strain and temperature as well as decreasing Mo contents. These macroscopic features are related to the reduced intensity of interactions between Ï phase particles and mobile dislocations as decreasing temperature and increasing Mo contents. Furthermore, a relatively higher temperature and lower Mo content tend to weaken the spatial cohesion of propagation bands and strengthen strain localization, leading to a change of PLC bands from type A to type B and the increase of strain rate within the PLC bands, which are related to the increased precipitation of Ï phases. Additionally, the elongation at fracture is significantly influenced by PLC effect in Ti-Mo alloys.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Shiyuan Luo, Philippe Castany, Sandrine Thuillier, Makara Huot,