Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 619, Issue -, Pages 616-620Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.09.012
Keywords
Superalloys; High pressure; X-ray diffraction; Nano-indentation; Elastic properties
Categories
Funding
- Air Force Office of Scientific Research [FA9550-12-1-0456]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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Samples of Ni3Al, Ni3Al:B and Ni-Al-Cr super alloys were prepared by directional solidification method and their effect of alloying with ternary elements on the mechanical properties was investigated. In-situ X-ray diffraction studies were carried out on undoped Ni3Al, Ni3Al:B with boron 500 ppm and Ni-Al-Cr with 7.5 at.% of chromium super alloys at high pressure using diamond anvil cell. The results indicate that micro-alloying with B forms gamma'-phase (L1(2) structure), similar to the pure Ni Al-3, while Ni-Al-Cr alloy consists of gamma' precipitates in a matrix of gamma-phase (Ni-FCC structure). The crystal structure of all three alloys was stable up to 20 GPa. Micro alloying with boron increases bulk modulus of Ni3Al by 8% whereas alloying with chromium has the opposite effect decreasing the modulus by 11% when compared to undoped alloy. Further, the elastic modulus and hardness of Ni3Al, Ni3Al:B and Ni-Al-Cr alloys were determined using the nano-indentation technique, in combination with compressibility data which enabled the estimation of shear modulus and Poisson's ratio of these alloys. (C) 2014 Elsevier B.V. All rights reserved.
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