Journal
ADVANCED ENGINEERING MATERIALS
Volume 23, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202100225
Keywords
laves phases; mechanical properties; microstructure; refractory high-entropy alloys
Categories
Funding
- National MCF Energy Research and Development Program [2018YFE0312400]
- National Natural Science Foundation of China [51822402, 51671044]
- National Key Research and Development Program of China [2019YFA0209901, 2018YFA0702901]
- Liao Ning Revitalization Talents Program [XLYC1807047]
- Fund of Science and Technology on Reactor Fuel and Materials Laboratory [6142A06190304]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201902]
- program of China Scholarships Council [201906060051]
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The effects of Ti and Nb contents on the phase equilibrium and mechanical properties of HfZrVTaMoWTixNby RHEAs were studied to achieve balanced properties in a wide temperature range. Increasing Ti or Nb content suppresses Laves phase precipitation, improves room temperature malleability, and enhances high-temperature performance.
Refractory high-entropy alloys (RHEAs) with excellent high-temperature performance are attractive for high-temperature structural applications. However, many RHEAs suffer from high density and poor room temperature (RT) malleability. Herein, the effects of Ti and Nb contents on the phase equilibrium and mechanical properties of HfZrVTaMoWTixNby RHEAs are studied to achieve unique balanced properties in a wide temperature range. With the increase of Ti or Nb content, the Laves phase precipitation is suppressed and RT malleability is improved. Particularly, the HfZrVTaMoWTi2Nb2 RHEA without Laves precipitates exhibits a high yield strength of 1.7 GPa and a compressive strain of similar to 30% at RT. Moreover, it retains a high systemic yield strength of 31 MPa cm(3) g(-1) at 1200 degrees C, which is nearly three times that of HfZrTaTiNb and nearly equal to that of MoWTaNb, suggesting its potential applicability at elevated temperatures.
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