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Thermal Stability and Thermoplastic Formability of Pd20Pt20Cu20Ni20P20 High Entropy Metallic Glass
Thermal stability and thermo-mechanical properties of Pd20Pt20Cu20Ni20P20 high entropy metallic glass (HEMG) were investigated by differential scanning calorimetry, X-ray diffraction, and thermomechanical analysis. Results show that compared with other classical precious metal-based metallic glasses, Pd20Pt20Cu20Ni20P20 HEMG presents comparable performance with distinct characteristics.
Effect of Mo on Microstructure and Properties of AlCoCrFeNiMox High Entropy Alloy Coatings Prepared by Laser Cladding
AlCoCrFeNiMox (x=0, 0.5, 1.0, 1.5, 2.0) high entropy alloy (HEA) coatings were prepared by laser cladding method. The effect of Mo content on the microstructure, hardness, and corrosion resistance of the coatings was studied. Results show that with increasing the Mo content, the microstructure is changed from (Al, Ni)-rich body-centered cubic (bcc) phase (Mo-Cr-Fe)-rich σ phase into (Fe, Ni)-rich bcc phase (Mo-Cr-Fe)-rich σ phase (Al-Fe-Mo)-rich σ phase a little AlN (aluminum nitride). Additionally, the coating hardness (HV1) is increased from 6514.4 MPa to 10652.6 MPa. With increasing the Mo addition, the self-corrosion potential of the coating in 3.5wt% NaCl solution is also increased. The coating presents the optimal corrosion resistance at x=1.0.
Deposition Behavior of HVOF Sprayed WC-12Co Particles on AA7075
Abstract: WC-12Co particles were deposited on polished AA7075 (7075 aluminum alloy) substrate by HVOF (high velocity oxy-fuel) spraying. The microstructure, composition and hardness of the deposits were analyzed by SEM, EDS and nanoindentation hardness tester, respectively. The deposition behavior of six types of particles in three different molten states, including non-molten, semi-molten, and molten particles, was investigated. Results show that different types of particles have great impact on the substrate, which makes the AA7075 substrate deform or causes tears. The surface morphology and cross-sectional morphology of the deposits are different from those of the original powder. The surface of the deposits exhibits certain melting characteristics, and the cross-section is relatively dense. The semi-molten particles and molten particles generate some tearing to the substrate, and have a metallurgical bonding with the substrate to form a mutual meting zone. After the deposition of the particles, a hardened layer is formed on substrate surface with a thickness about 5 μm, and there is a certain gradient change in the hardness. The hardness near the surface is 3420 MPa, which is 1.56 times higher than that of the substrate (2200 MPa). The increase in hardness is originated from two factors: the peening effect of particles at high temperature and high speed, and the work hardening caused by particle extruding substrate. Key words:HVOF;AA 7075;deposition behavior;melt;metallurgical bond;harden layer
Effect of Heat Treatment on Microstructure and Properties of Titanium Alloy Welded Joint by Laser Welding with Flux-Cored Wire
Ti-6Al-4V titanium alloy plate was welded by a laser beam with self-developed titanium alloy flux-cored wire. The welded joint was solution treated at 920 °C for 1 h and aging treated at 650 °C for 2 h, and its microstructure and properties were compared with those of the as-welded joint. The results show that the heat-treated welded joint is composed of a typical tri-modal microstructure containing αp phase, αs phase colony, and αgb phase, as well as punctate distributed residue β phase. α' martensite microstructure in the as-welded joint is not found in the heat-treated joint, which makes the strength, plasticity, and toughness well balanced and maintained. The strength of the heat-treated welded joint is reduced, while elongation and impact toughness at room temperature are enhanced. The tensile fracture of the heat-treated welded joint is surrounded by massive shear lips. The dimples are deep and uniform, presenting as microvoid coalescence ductile fracture. In the as-welded joint, the proportion of large-angle grain boundaries with misorientation between grains in the weld zone greater than 15° accounts for 83.78%, and in the heat-treated welded joint, the proportion is about 90.21%. Through XRD test, it is discovered that the as-welded weld is mainly composed of α' martensite, with a small amount of extremely weak multi-angle α phase diffraction peak. In the heat-treated weld, the central angle position of α phase diffraction peak is consistent with that of α' martensite in the as-welded weld, with a sharp β phase (110) diffraction peak observed as well.
Uniform Elongation and Yield-Drop Phenomenon in Magnetically Annealed 1050 Aluminum Alloy Prepared by CryoECAP
The ultrafine grained (UFG) 1050 aluminum alloy was prepared by equal channel angular pressing at cryogenic temperature, namely cryoECAP process. The tensile behavior and microstructures of UFG 1050 aluminum alloy after annealing at 90–210 °C for 4 h without and with high magnetic field of 12 T were investigated by tensile tests, transmission electron microscope, and electron backscattered diffraction analyses. After cryoECAP and annealing treatments, the 1050 aluminum alloy has ultrafine grains with 0.7–1.28 μm in size, the ratio of ultimate tensile strength to yield strength is less than 1.24, and the uniform elongation is less than 2.3%. With increasing the annealing temperature from 90 °C to 210 °C, the yield-drop phenomenon becomes more obvious due to the decrease in mobile dislocations to maintain the applied strain rate during tensile deformation. The uniform elongation decreases from 1.55% to 0.55%, the dislocation density reduces from 5.6×1014 m-2 to 4.2×1013 m-2, and the fraction of high-angle grain boundaries (HABs) increases from 63.8% to 70.8%. These phenomena cause the higher annihilation rate of dislocations, thereby leading to the degradation of strain hardening effect. During annealing under high magnetic field at 90–210 °C, the low fraction of HABs (61.7%–66.2%) can provide a slower annihilation rate of dislocations, therefore resulting in the higher uniform elongation (0.64%–1.60%) and slower decrease in the flow stress after the yield peak.
Effect of Primary α-Phase on Micro-area Plastic Deformation of Ti6242s Alloy Under Dwell Fatigue
The relationship between microstructure characteristics and fatigue properties of Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti6242s) alloy was investigated. According to the microstructure quantitative analysis results, the solution treatments at different temperatures have an obvious effect on the proportion and morphology of primary α-phase. The changes in microstructure characteristics slightly influence the tensile property and low-cycle fatigue property of Ti6242s alloy at room temperature, whereas the dwell fatigue life and the fatigue sensitivity index are sensitive to these changes. Additionally, it is verified that the relatively strong stress concentration and inhomogeneous micro-area plastic deformation occur in the Ti6242s alloy under dwell fatigue load. Moreover, the characteristics of small plane regions and the surrounding quasi-cleavage regions in the Ti6242s alloy under dwell fatigue load at room temperature are formed through the analysis of fatigue failure fracture morphologies. The related experiment results are in good agreement with the stress-strain distribution characterizations of microstructures of equiaxed primary α-phase and the surrounding soft phase/grain. Accordingly, the relatively low inhomogeneous micro-area plastic deformation in the alloy with equiaxed primary α-phase of low volume fraction is beneficial to reduce the probability of crack initiation and can delay crack propagation, thus improving the dwell fatigue property.