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The Zr1-xAlxN films have been deposited on Si (111) and glass (soda lime glass) substrates by ion beam assisted deposition. The microstructure, morphology, electrical resistivity and optical properties of the Zr1-xAlxN films were investigated by XRD, TEM, four-probe method and spectroscopic ellipsometry. In the Al composition range 0.32 ≤ x ≤ 0.7, the Zr1-xAlxN films contain crystallized ZrAlN (NaCl...
The crystallization behavior of Er-doped Ge2Sb2Te5 phase-change materials is investigated systemically for phase change memory application. It is observed that Er dopants can serve as a center for suppression of face-centered-cubic to hexagonal phase transition of Ge2Sb2Te5 films, leading to a one-step crystallization process. The crystallization temperature, 10-year data retention ability and crystalline...
The microstructure, hardness, precipitates and phase transformation are studied before and after a process of 1050°C solid solution + double ageing for Inconel 718 alloys fabricated by SLM. The test results show that the obvious weld beads structure can be observed on unheated surface of alloys. The microstructure shows seriously inhomogeneous with distributing columnar crystals and fine dendrites...
The thermal stability and its crystallization behavior in Ge-Mg-Te films were investigated. The results reveal that the bond combination among Mg, Ge and Te has occurred in Mg-Ge-Te. The formed Mg-Ge and Mg-Te phases increase the crystallization temperature, crystalline resistance and optical band gap. The ratios between amorphous and crystalline states were increased to 108. The crystal phase was...
The effect of treatment in weld surface on four-point bend fatigue properties and fracture characteristic of Ti–6.5Al–2Zr–1Mo–1V alloy by vacuum electron beam welding were tested and analyzed. When the excess weld metal and excess penetration are removed, the high fatigue strength of joints can be obtained. When the excess weld metal and excess penetration were not removed, the fatigue strength of...
The refractory alloy 50Mo–50Re thin sheet was welded successfully by small-scale laser lap welding. There were obvious gas pores and cracks near the interface of the laser lap-welded joint. The hardness (HV420) near the interface zone of laser lap-welded joint was obviously higher than that in the heat-affected zone (HV370) and base metal (HV290). The fracture morphology near the interface zone shows...
Thermal analysis and phase transformation of aluminium matrix surface composite adding Al-based amorphous fabricated by FSP was studied. The test result indicated that the surface composite mainly is composed of a large number of nano structures. AlCuMg precipitated phases and incomplete crystallization amorphous phases form the in a nano-structure matrix. The exothermic area of base metal is bigger...
A nanostructured layer was fabricated by using fast multiple rotation rolling (FMRR) on the surface of Ti-6Al-4V alloy, with grain size 10–19 nm in the top surface layer by means of XRD and TEM analysis. A deformation layer with thickness about 80 μm is clearly observed in the cross section of FMRR sample. The microhardness of the FMRR sample has an obvious change along the depth from about 368 HV...
The microstructure and phase constitution near the diffusion bonding interface of Mg/Al dissimilar materials are studied using a scanning electron microscope (SEM), X-ray diffraction (XRD) and transmission electron microscope (TEM). The test results indicated that an obvious diffusion zone was formed near the Mg/Al interface during the vacuum diffusion bonding. The diffusion transition zone near the...
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