In this study, spherical indentation responses of room temperature superelastic (homogenized Ni50.8Ti49.2 and 400°C 3 h aged Ni45.3Ti29.7Hf20Pd5) and nonsuperelastic (Ni49.9Ti50.1 and 600°C 3 h aged Ni45.3Ti29.7Hf20Pd5) are revealed as functions of maximum loading level in nano and macro scales. Experimental results showed that for all alloys, the depth and work recovery ratio decrease and then saturate with hmax/R. In contrast, indentation hardness increases and then saturates with indentation depth. Both NiTi and NiTiHfPd alloys have higher hardness in austenite than in martensite. NiTiHfPd alloys have a higher indentation hardness than NiTi alloys which was attributed to the higher strength of NiTiHfPd alloys.
|Number of pages||7|
|Journal||Journal of Alloys and Compounds|
|State||Published - Dec 5 2015|
Bibliographical noteFunding Information:
This work was supported by the NASA EPSCOR (grant No: NNX11AQ31A ), National Science Foundation (grant No: 0959896 ) and the Kentucky Science and Engineering Foundation (grant No: KSEF-1718-RDE-011 ).
© 2015 Elsevier B.V. All rights reserved.
- NiTiHfPd alloys
- Phase transformation
- Shape memory alloys
- Spherical indentation
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry