LT-3 aluminum alloy is a kind of two-side cladding aluminum special used in vacuum brazing. Differential Scanning Calorimeter （DSC） was used to measure the exothermic and endothermic reaction during the brazing proc...LT-3 aluminum alloy is a kind of two-side cladding aluminum special used in vacuum brazing. Differential Scanning Calorimeter （DSC） was used to measure the exothermic and endothermic reaction during the brazing process that the cortex metal and the base metal are melted and re-crystal. The analysis results inidicate that eutectic reaction is the main reaction in the melted cortex metal crystallization process. But the main reaction in the melted base metal crystallization process is the reaction that α-A1 segregated out. According to the experimental details, the critical work of nucleation is 3.82×10-17J, the critical radius of nucleation is 8.69×10-10 m, the volume of critical crystal nucleus is 2.75×10-27 m3 and the per unit cell in critical crystal nucleus is 43.展开更多
Using differential scanning calorimetry, a systematic investigation of the phase diagram of the CeH_2CeH_3 system has been performed. Based on the measurements carried out on high purity samples and supported by high ...Using differential scanning calorimetry, a systematic investigation of the phase diagram of the CeH_2CeH_3 system has been performed. Based on the measurements carried out on high purity samples and supported by high accuracy hydrogen content determination, a new Tx phase diagram for 110<T<400 K and 2<x<3(CeHx) is proposed. This new phase diagram shows an up to now unknown complex phase relationships with the existence of at least 13 phases at T<400 K.展开更多
文摘LT-3 aluminum alloy is a kind of two-side cladding aluminum special used in vacuum brazing. Differential Scanning Calorimeter （DSC） was used to measure the exothermic and endothermic reaction during the brazing process that the cortex metal and the base metal are melted and re-crystal. The analysis results inidicate that eutectic reaction is the main reaction in the melted cortex metal crystallization process. But the main reaction in the melted base metal crystallization process is the reaction that α-A1 segregated out. According to the experimental details, the critical work of nucleation is 3.82×10-17J, the critical radius of nucleation is 8.69×10-10 m, the volume of critical crystal nucleus is 2.75×10-27 m3 and the per unit cell in critical crystal nucleus is 43.
文摘Using differential scanning calorimetry, a systematic investigation of the phase diagram of the CeH_2CeH_3 system has been performed. Based on the measurements carried out on high purity samples and supported by high accuracy hydrogen content determination, a new Tx phase diagram for 110<T<400 K and 2<x<3(CeHx) is proposed. This new phase diagram shows an up to now unknown complex phase relationships with the existence of at least 13 phases at T<400 K.
