High-pressure synchrotron radiation diffraction studies of icosahedral Ti-Zr-Ni and hydrogenated Ti-Zr-Ni quasicrystals

Abstract

We present results from in situ x-ray diffraction studies of hydrogenated icosahedral Ti-Zr-Ni quasicrystals carried out under high pressure. The icosahedral Ti53Zr27Ni20 phase and hydrogenated icosahedral Ti45Zr38Ni17 samples that contain 0.32 and 1.45 hydrogen atoms for each metal atom were studied. The icosahedral quasicrystal structure is retained up to the highest pressures investigated. The six-dimensional lattice parameter was obtained as a function of pressure for the different samples. The zero-pressure bulk modulus and its pressure derivative were determined by fitting a Murnaghan-type equation of state to the relative volume change V/V0. The zero-pressure bulk modulus is respectively obtained as B0 = 130±10, 105±10, and 110±20 GPa for H/M equal to 0, 0.32, and 1.45 using a constant value for the first derivative B'0: 5.5±1. It seems, therefore, that the icosahedral Ti-Zr-Ni phase may be more compressible after hydrogenation, but there is no clear difference for different H/M contents. These results are tentatively related to the local structure of these materials.

High pressure Mössbauer studies of stable quasicrystal Al63.5Cu24Fe12.5

“…Al-Mn quasicrystalline alloys were found to be stable upto pressures of 47 GPa [5], while Al-Li-Cu quasicrystals transform irreversibly to an amorphous phase around 20 GPa [6]. In metastable Al-Cu-TM (TM ¼ V, Cr, Mn) [7], and Ti-Zr-Ni [8,9] quasicrystals in situ XRD measurements have been used to study the high pressure stability and the bulk modulus.…”

High-pressure effects on Ti–Zr–Ni metallic glass and its corresponding quasicrystal

“…Recent researches [18,19] on Ti-Zr-Ni quasicrystals showed that they are quite stable at high pressures up to 30 GPa. However, no high pressure behaviors for amorphous Ti-Zr-Ni were investigated.…”