Microstructure and Properties of Ternary Cu-Ti-Sn Alloy

Wang

et al. 2020

The study investigates the effect of heat treatment on the microstructure evolution and properties of an age-hardened Cu-3Ti-2Mg alloy. The precipitated Cu 2 Mg and β'-Cu 4 Ti phases consequently yield a depletion of the Cu matrix in regards to Ti and Mg solutes, which enhances the electrical conductivity. The Cu 2 Mg Laves phase and β'-Cu 4 Ti phase precipitates increase the hardness of the alloy due to the consistency and coherency of the later phase. However, the decrease of hardness is mainly associated with the coarse microstructures, that can be formed due to the phase transformation from metastable β'-Cu 4 Ti phase to more stable Cu 3 Ti phase. In the range of experiments, the optimum process is solution treatment at 700°C for 4 h, with subsequent age-hardening at 450°C for 4 h. The electrical conductivity, hardness, tensile strength, and elongation of the Cu-3Ti-2Mg alloy were 15.34 %I ACS, 344 HV, 533 MPa, and 12%, respectively.

Section: Resultssupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Wang

et al. 2020

“…As the strengthening effect of the β -Cu 4 Ti phase was stronger than that of the β-Cu 4 Ti phase, the value of hardness reduced, moderately. The formation rate of the discontinuous β-Cu 4 Ti phase depended on the diffusion rate of the Ti atoms [15]. The Fe 2 Ti intermetallic phase suppressed the diffusion of the Ti atoms, resulting in the suppression of the phase transformation from the β -Cu 4 Ti to the β-Cu 4 Ti phase.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Addition of alloying element appears to be an effective way to improve the mechanical and electrical properties of the age-hardenable Cu-Ti alloys [11][12][13][14][15]. Extensive investigations have been carried out to realize the effects of various alloying elements on the age hardening behavior of the Cu-Ti alloys.…”

Section: Introductionmentioning

confidence: 99%

Effects of Trace Alloying Elements Fe and Cr on the Microstructure and Aging Properties of Cu-3Ti Alloy Foils

Zhao

Dong

et al. 2018

Metals

In this work, the effects of an addition of trace alloying elements, Fe and Cr, on the mechanical and electrical properties and corrosion resistance of Cu-3Ti alloy foils, have been investigated. The results showed that the individual addition of Fe leads to the formation of Fe2Ti intermetallic phase, which refines the grain size, in the solution-treated condition. With a combined addition of Fe and Cr, the formation of the (FeCr)2Ti phase and the precipitation of the β′-Cu4Ti phase resulted in increased hardness in the peak-aged condition. The ultimate tensile strength and yield strength of the peak-aged Cu-Ti-Fe-Cr alloy were 13% and 5.7% higher, than those of the Cu-3Ti alloy, respectively. The electrical conductivity of the peak-aged Cu-Ti-Fe-Cr alloy was 3.3% higher than that of the Cu-Ti-Fe alloy, due to the finer (FeCr)2Ti phase and the less residual Ti atoms, in the Cu matrix. The combined addition of Fe and Cr elements could improve the corrosion resistance of the Cu-Ti alloy. The Cu-Ti-Fe-Cr alloy foil could obtain the best integrated properties, and the hardness, ultimate tensile strength, and electrical conductivity were 357.1 HV, 1068 MPa and 12.5% IACS, respectively.

“…Thereby, it is extremely important that these untypical structures be characterised as thoroughly as possible (Boettinger et al, 2000). Only in a limited amount of studies, the characterisation methods of the crystal structures and compositions of crystalline phases in non-equilibrium conditions have been detailed (Wang et al, 2015;Gröbner et al, 2016). Consequently, there has been a considerable delay in the progress of this potentially exciting area.…”

Section: Introductionmentioning

confidence: 99%

Crystalline phases found in rapidly quenched Ni–Nb–Zr alloys

Déo

Kaufman

Wang

et al. 2017

Journal of Microscopy

The properties of metallic alloys can be significantly improved by developing non-equilibrium phases in the microstructures through rapid solidification techniques, thus the characterisation of these unusual structures is extremely important. In this research, the microstructures of three rapidly quenched alloys, namely Ni Nb Zr , Ni Nb Zr and Ni Nb Zr (at. %) were investigated in greater detail in order to determine the structures and compositions of their crystalline phases. These crystalline phases were characterised using a combination of scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction and transmission electron microscopy techniques. The phases were compared to the crystalline structures reported in the literature. Our results indicate some agreement with the Ni-Nb phase diagram and an isothermal section of the Ni-Nb-Zr phase diagram; however, it is detected zirconium solubility in the Ni Nb phase, as well as, the absence of expected crystalline phases.