Yield strength of Ni-Al-Cr superalloy under pressure

JOURNAL OF ALLOYS AND COMPOUNDS

卷:657

Article

Raju, S. V.¹  Godwal, B. K.²  Yan, J.^3,4  Jeanloz, R.^2,5,6  Saxena, S. K.¹ 

[1] Florida Int Univ, Dept Mech Engn, CeSMEC, Miami, FL 33172 USA

[2] Univ Calif Berkeley, Earth & Planetary Sci, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94730 USA

[4] Univ Calif Santa Cruz, Earth & Planetary Sci Dept, Santa Cruz, CA 95064 USA

[5] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

关键词: Metals and alloys;    Rapid-solidification;    Quenching;    Elasticity;    Mechanical properties;    Strain;    High pressure;    X-ray diffraction;   

DOI  :  10.1016/j.jallcom.2015.10.092

来源: Elsevier

【 摘 要 】

Ni based superalloy Ni-Al-Cr with gamma and gamma' phase was studied under high pressure up to 30 GPa using diamond anvil cell technique. In-situ X-ray diffraction data was collected on these alloys under hydrostatic and non-hydrostatic conditions. Cubic phase remains stable up to the highest pressure of about 30 GPa. Bulk modulus and its pressure derivative obtained from the volume compression of pressure data are K = 166.6 +/- 5.8 GPa with K' set to 4 under hydrostatic conditions and K = 211.3 +/- 4.7 GPa with K' set to 4 for non-hydrostatic conditions. Using lattice strain theory, maximum shear stress 't' was determined from the difference between the axial and radial stress components in the sample. The magnitude of shear stress suggests that the lower limit of compressive strength increases with pressure and shows maximum yield strength of 1.8 +/- 0.3 GPa at 20 GPa. Further, we have also determined yield strength using pressure gradient method. In both the methods, yield strength increases linearly with applied pressure. The results are found to be in good agreement with each other and the literature values at ambient conditions. (C) 2015 Elsevier B.V. All rights reserved.

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