摘要:

AbstractThe kinetics of the interface reaction at the early stage of alloy growth in tinplate has been investigated below and above the melting point of tin, and a theory has been developed to determine the reaction time between iron and tin. This time defines the first stage of alloy growth during which the FeSn2nuclei grow laterally and cover the iron/tin interface with an extremely thin reaction alloy layer. An analytical formula has been obtained for calculating the reaction time as a function of the heating temperature, and the reaction time was also determined experimentally. The results obtained by both methods show very good agreement. The activation energy for FeSn2formation was determined as a separate term of energy, contributing to the activation energy for diffusion controlled growth. Close values were obtained in both cases below and above the melting point of tin. Determination of the reaction time allows the prediction of the actual duration of the reflowing period and hence the growth of the alloy layer can be accurately controlled.MST/426

ISSN:0267-0836    

DOI:10.1179/mst.1987.3.1.66

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

摘要:

AbstractAluminium oxide dispersoid strengthened copper grade Glid-Cop Al-15 fine and coarse mesh fractions have been hot consolidated at 1144 K and then cold worked to 31 and 86%. Tensile and stress rupture specimens were tested to investigate the relationships between microstructure and mechanical properties at room and elevated temperatures. Grain and therefore particle aspect ratio is the most critical structural parameter controlling the high-temperature deformation, which is dominated by grain boundary sliding and intergranular fracture. Grain boundary strengthening is also significant at lower temperatures. Thus, increasing the amount of deformation during the thermomechanical processing of powders can result in high aspect ratios and improved high-temperature mechanical properties. Particle size is found not to play a critical role provided that the aspect ratio is high.MST/332

ISSN:0267-0836    

DOI:10.1179/mst.1987.3.1.72

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

ISSN:0267-0836    

DOI:10.1179/mst.1987.3.1.76

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor