Deformation stacking fault probability and dislocation microstructure of cold worked Cu–Sn–5Zn alloys by x-ray diffraction line profile analysis

Abstract

Plastically deformed (hand-filed) Cu–Sn–5Zn ternary alloys with Sn concentrations 1, 2.5, and 5wt% are investigated. Microstructural parameters are studied in terms of x-ray diffraction profile fitting analysis. It is observed by Dey et al. [Acta. Mater. 53, 4635 (2005)] that the change in stacking fault probability (α) with Sn concentration for ternary Cu–Sn–5Zn alloys is similar to Cu-based binary alloy (Cu–Sn) system but behaves in a different manner from Cu–1Sn–Zn ternary alloy systems. The crystallite size distribution is broader for alloy with 1wt% Sn and becomes narrower with increasing Sn concentration. Value of dislocation density (ρ) is of the order of 1015m−2 and shows a compositional dependence. Type of dislocation is found to be predominantly screw; ⟨100⟩-type dipoles may also be present in the cold-worked alloys. The dislocation arrangement is found to be more correlated in case of 1wt% Sn compared to other alloys of higher Sn concentration. The stacking fault energy (γ) is obtained from modified Reed-Schramm equation and is of the order of 20mJm−2 with no significant compositional dependence.

Galvanically replaced Au–Pd nanostructures: study of their enhanced elemental mercury sorption capacity over gold

“…Peak shifts usually occur due to strain from crystal defects. 40 A shift to the left is usually due to compressive rather than tensile stress leading to larger lattice parameter thus indicating the possibility of increase in cell size and/or surface roughness. The increase in surface roughness with increasing GR reaction time is supported by the AFM roughness data and is highly advantageous for mercury.…”

Generalised stacking fault energies of copper alloys - density functional theory calculations

“…Sn: A lot of effort has been made on TWA of Cu-Sn and Cu-Sn-based alloys [112,119,120,[136][137][138]. The negative value of SFE and TE in fcc Cu-Sn is the effect of the observed phase transition to D0 19 ordered structure in high Cu concentration alloys [137,138].…”

“…Tadmor and Bernstein have shown that the tendency to deformation twining in a face-centered cubic (fcc) lattice depends on unstable stacking fault energy (USFE), and unstable twining energy (UTE) [24]. The unstable stacking fault energy is the maximum energy per unit area reached when one part of the crystal is shifted on a (111) plane along a [112] direction and the stacking fault is created. The unstable twinning energy is the maximum energy per unit area reached when one part of the crystal over stacking fault is shifted on a (111) plane along a [112] direction and the twin is created.…”

“…The unstable stacking fault energy is the maximum energy per unit area reached when one part of the crystal is shifted on a (111) plane along a [112] direction and the stacking fault is created. The unstable twinning energy is the maximum energy per unit area reached when one part of the crystal over stacking fault is shifted on a (111) plane along a [112] direction and the twin is created. However, the experimental measurement of these two values is impossible; USFE and UTE are determined by atomistic scale calculations [25,26].…”

Stacking fault energy and creep mechanism of a single-crystal nickel-based superalloy

“…So it is necessary to study the factors that affect and restrict the performance of single-crystal nickel-based superalloys. Stacking fault as a structural defect of crystal materials, which alters the local symmetry of the crystal and causes the energy to increase in a local area, the increased energy is the stacking fault energy [3]. Stacking fault is an inherent property of crystal material, crystal materials have different stacking fault energies at different temperatures [4].…”