About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
|
Presentation Title |
Nanoindentation Creep Testing: Advantages and Limitations of the Constant Contact Pressure Method |
Author(s) |
Karsten Durst, Christian Minnert |
On-Site Speaker (Planned) |
Karsten Durst |
Abstract Scope |
Different loading protocols have been developed in the past to investigate the creep properties of materials using instrumented indentation testing technique. We recently presented a new indentation creep method, in which the contact pressure is kept constant, similar to the stress in a uniaxial creep experiment. In this study, the results of constant contact pressure indentation tests are compared to uniaxial creep experiments on ultrafine grained alloy such as Cu and CuAl5. The constant contact pressure method yield similar stress exponents as the uniaxial creep tests, down to strain rates of 10-6 s-1. Furthermore, a pronounced change in the power exponent at large stress reductions is found for both uniaxial and CCP tests, indicating a change in deformation mechanism of the ultrafine grained materials. The CCP technique thus offers new possibility of performing long-term creep experiments while retaining the contact stress underneath the tip constant. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Other, Other |