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Effects of heat treatment on the properties of powder injection molded AlN ceramicsAkhtar Farida摘 要:The effects of two different heat-treatment atmospheres... samples were reheated.The result reveals that the heat-treatment atmosphere has significant effect on the properties and secondary phase of AlN ceramics.The thermal conductivity and density of AlN......
mechanical properties with a yield strength of 867 MPa,an ultimate tensile strength of 1188 MPa,and an elongation of 27.9% in the as-deposited condition.The mechanical properties of the heat-treated... precipitation and coarsening of γ’ and carbides during heat-treatment.Microstructural investigation of the alloy revealed spherical γ’ with a rippled size distribution from the center......
-treatment. Meanwhile, the (Nb,X)5Si3 slices in the eutectic cells of the DS specimens coarsen obviously after heat-treatment. Homogenizing and aging treatments could effectively eliminate elemental microsegregation, and the segregation ratios of all elements in niobium solid solution (Nbss) in different regions tend to 1. After heat-treatment, the microhardness of retained eutectic cells increases......
polarized light microscope (PLM) and scanning electron microscope (SEM), and the flexural behaviors before and after heat-treatment were studied with a universal mechanical testing machine. The fracture...-laminar micro-cracks. With the decreasing density, the strength of the composites decreases and the toughness increases slightly; after 2500 °C heat-treatment, the inter-laminar micro-cracks in matrix......
. The as-cast samples were examined radiographically to ensure that no casting defects were present in the final castings; the samples were then heat-treated using a standard heat-treatment cycle... harmful phases such as σ and η phases were present in the as-cast samples. The γ′ precipitates with cubic morphology appeared in the matrix after the standard heat-treatment process. The extent......
diffraction(XRD) spectrometer.A direct carbonation at 300℃followed by catalytic pyrolysis(heat-treatment temperature was set at 700-1400℃) under a vacuum condition was used for turning wood waste... that the FWHM and the calculated graphene sheet content of pyrolized wood char powders depended on the heat-treatment temperature,and the FWHM of wood char powder with well-developed graphene sheets......
Selective laser melting of near-α titanium alloy Ti-6Al-2Zr-1Mo-1V:Parameter optimization, heat treatment and mechanical performanceChao Cai1,Xu Wu1,Wan Liu2,Wei Zhu1,Hui Chen3,Jasper Chua Dong...">This paper presents a comprehensive study conducted to optimize the selective laser melting(SLM)parameters and subsequent heat-treatment temperatures for near-α high-temperature titanium alloy Ti-6 Al-2 Zr-1......
Metallurgy, Central South University, Changsha 410083, China) Abstract: The nanocrystalline WC-6Co(mass fraction) composite powders were prepared by mechanical activation- reaction heat treatment using W, C... the feature of low reaction temperature and fast reaction speed in the heat-treatment process. At 900 ℃ heat-treatment for 35 min, WC-6Co composite powder of 33.3 nm grain size is obtained. The grain......
microscopy(SEM),UV-vis-NIR scanning spectrophotometry,and fluorescence spectrometry.The results show that the main crystalline phase of glass-ceramics is nepheline.The best heat-treatment process is at 520......
-energy ball milling and post heat-treatment method.The 4-wire and 2-wire measuring modes are used to investigate the transport character of the grain/phase boundary(inner interface) and electrode-bulk......
