The conductive oxide impact on Aluminum alloy of YAG pulse laser welding
Few articles are reported about conductive oxide impacting on Aluminum alloy of Nd: YAG pulse laser welding at present. Therefore, this paper takes one typical Aluminum alloy as laser welding samples. Through SEM (scanning electron microscope) microscopic analysis and contrast, the comparative study between on with and without surface conductive oxidation impacting on laser welding samples have been conducted. The results show that the laser welding process parameters are needed, but the conductive oxide will bring no destructive effect on laser welding. Accordingly for this reason, it is thought that the conductive oxide will not bring substantial effect on Aluminum alloy of Nd: YAG pulse laser welding.
APPLICATION AND DEVELOPMENT OF LASER-PROCESSING TECHNOLOGY
The applied fields of laser-processing technology is introduced in broad outline.Some typical applications are discussed,such as laser drilling and cutting,laser welding,changed function fechnology on surface,laser carving,milling and texturing,laser deposit,quich-formed technology,laser marking and mark carving.Meanwhile,the present situation of the laser processing industry at home and abroad is introduced.
Phase formation during mechanical alloying in the Ti–Si system
Abstract Mechanical alloying of Ti–Si powder mixture or TiH 1.924 –Si powder mixture was performed by high-energy ball milling, in which the Ti to Si mole ratio was 1:2. The phase formations in both mixtures during milling were investigated by X-ray diffraction. Mechanical alloying a mixture of elemental powders led to the formation of TiSi 2 equilibrium compound, while when starting from Si + TiH 1.924 , a metastable phase was formed. The metastable phase completely transforms to TiSi 2 when the mechanically alloyed powder is annealed at temperatures above 800 °C. Two different pathways of phase transitions during mechanical alloying are attributed to the existence of hydrogen atoms, i.e., when starting from Si + TiH 1.924 compared to Si + Ti, the kinetics for the formation of the TiSi 2 intermetallic compound slows down. The kinetics related to the different phase transitions depending on the starting powder mixture are discussed.