Direct-chill semi-continuous casting process of three-layer composite ingot of 4045/3004/4045 aluminum alloys

Three-layer composite ingot of 4045/3004/4045 aluminum alloys was prepared by direct-chill semi-continuous casting process,the temperature field distribution near the composite interface,macro-morphology,microstructure and composition distribution of the composite interface were investigated.The results show that semi-solid layer with a certain thickness forms near the interface due to the effect of cooling plate,which ensures successful implementation of casting the composite ingot.Two different aluminum alloys are well bonded metallurgically.The mechanical properties of composite interface were measured,the tensile and shearing strengths of composite interface are 105 and 88 MPa,respectively,which proves that the composite interface is a kind of metallurgical bonding.

FTTH光配线与网络的互动濞进

本文结合光纤到户（FTTH）部署PON技术、线缆、器件、施工因素，深入全面地分析了光纤到户规模部署下光配线产品变化趋势以及产品的应用选型，用全新的理念剖析了FTTH发展中光配线产品与网络部署的互动与演进，从不同角度对光配线产品设计、歼发、应用、布局等阐述了独特的创新思维。