Tensile behavior of a free-standing Pt-aluminide (PtAl) bond coat |
| |
Authors: | Md Zafir Alam SV Kamat V Jayaram Dipak K Das |
| |
Affiliation: | 1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500 058, India;2. Indian Institute of Science, Bangalore 560 012, India |
| |
Abstract: | The tensile behavior of a high activity stand-alone Pt-aluminide (PtAl) bond coat was evaluated by the micro-tensile test method at various temperatures (room temperature to 1100 °C) and strain rates (10?5 s?1–10?1 s?1). At all strain rates, the stress–strain behavior of the stand-alone coating was significantly affected by the variation in temperature. The stress–strain response was linear, indicating brittle behavior, at temperatures below the brittle–ductile transition temperature (BDTT). The coating exhibited appreciable ductility (up to 2%) above the BDTT. The strength (both yield stress and ultimate tensile strength) of the coating decreased and its ductility increased with increasing temperature above the BDTT. The tensile behavior of the coating was sensitive to strain rate in the ductile regime, with its strength increasing with increasing strain rate at any given temperature. The BDTT of the coating was found to increase with increasing with increasing strain rate. The coating exhibited two distinct mechanisms of deformation above the BDTT. The transition temperature for the change of deformation mechanism also increased with increasing strain rate. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|