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at different temperatures respectively, were investigated by differential thermal analysis(DTA), X-ray diffraction(XRD), and laser optical microscopy(LOM), scanning electron microscopy (SEM... constitutions of these specimens were identified using an X-ray diffractometer (D/MAX 2000/PC, Rigaku). The differential thermal analysis of the as-cast specimen was conducted with Ar atmosphere protecting......
) method for simulating flow along the cooling slope was presented. Equations for conservation of mass, momentum, energy and species were solved to predict hydrodynamic and thermal behavior... to predict hydrodynamic and thermal behavior of the flowing molten alloy, in addition to predicting solid fraction distribution and macrosegregation. With this viewpoint, the present paper deals......
boundaries in the Hf free alloy. During the long-term thermal exposure, fine discrete M23C6 carbides decompose from primary carbide, inducing γ′ layer along the grain boundary, and the coarsening of grain...;Boride morphologies in Hf-contained (a) and Hf free alloys (b) after thermal exposure at 850 ℃ for 10 000 h 图6 合金经过850 ℃时效3 000 h后的晶界TEM像和相应的EDS谱 Fig.6 TEM images and corresponding EDS......
to decrease. The equilibrium morphology of the crystal grows into a square-like one in the situation of low dimensionless supercooling degree; with an increase in dimensionless thermal supercooling degree...生长形貌 Fig.4 Dendrite morphologies at γ=0.1, t=30 000 Δt and different dimensionless thermal supercooling degrees: (a) Ωt =0.01; (b) Ωt =0.03; (c) Ωt =0.05; (d) Ωt =0.1 为了定量分析无量纲热过冷度对枝晶生长行为的影响,考......
microscopy (TEM) and scanning electron microscopy (SEM). The thermal behavior was studied using differential scanning calorimetry (DSC). Based on the results obtained, it can be concluded... and electric products of the European Union market. The pollution-free Ag-SnO2 alloy has been used to replace toxic Ag-CdO contact materials in the last two decades. However, SnO2 has a higher thermal......
constituent, thermal stability and microstructure of the alloys were investigated by using X-ray diffraction, differential scanning calorimetry and scanning electron microscopy, respectively. The effects... analyzed by X-ray diffraction (XRD) (Rigaku D/max 2400). The thermal stability of the alloys was investigated by differential scanning calorimeter (DSC) (Q100 V9.0 Build 275) at a heating rate of 20 K/min......
)73Cr17Zr10:Am→α-Fe(Co)+Am'→α-Fe(Co)+Cr2Ni3+Fe3Ni2+Cr2Zr+unidentified phase. With increasing Co/Ni mole ratio, the thermal stability of the alloys is enhanced and the precipitation of α-Fe(Co) after..., 1988, 64: 6044-6046. [3] LI Jia-wei, YANG Wei-ming, ESTEVEZ D, CHEN Guo-xin, ZHAO Wen-guang, MAN Qi-kui, ZHAO Yuan-yun, ZHANG Zhi-dong, SHEN Bao-long. Thermal stability, magnetic and mechanical......
related with the soldering peak temperature, cooling rate and the thermal gradient of the interface of joints; the distribution of IMC is related with solder composition and the diffusivity of metal... joints in electronic packaging technology[J]. Materials Science and Engineering: R, 2002, 38(2): 55-105. [5] Tu P L, Chan Y C, Lai J K L. Effect of intermetallic compounds on the thermal fatigue......
(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: The electro-thermal fields, thermal-stress fields and electro-magneto-flow fields...(electrolyte)-liquid(melt metal)-gas" and "liquid-gas-solid(particles)" three-phase models and the 3D simulation coupling models and algorithms of multi-physical field (electric, magnetic, thermal, flow......
algorithm based on the shrinking sphere assumption. The effects of some convection and thermal condition parameters on the dissolution process were studied. The calculated results show that the decrease... is the Prandtl number calculated by Sc=cBμBλB-1; h is the convection coefficient; dL is the agglomerated particle diameter; λB is the thermal conductivity of the bath; cB is bath specific heat capacity......