Investigation on Crack of Mg-Li alloy during Laser Rapid prototyping
Through mathematical analysis and simulation, the mechanical properties of Mg-Li alloy by laser rapid prototyping (LRP) have been investigated. The Mg-Li alloy with deposition phase is of higher strength, lower ductility and more distinct anisotropy. The defect of LRP is studied using microscopic analysis methods. The spherical porosity is randomly distributed in Mg-Li alloy samples because of loose powders and irregular ill bonding. The cracks produced in LRP Mg-Li alloy are studied. The investigation results show that the cladding cracks are formed in grain boundary with dendrite structure commonly and presented as characteristics of cracking along grains. The cracks are formed at high temperature. The prototyping mechanism on the cracks produced in LRP of Mg-Li super-alloy has been investigated. It is concluded that the liquefying cracks are with cracking characteristics along grains. The pre-layer is pulled apart by the increasing residual tensile stress in the laser deposition process and the cracks enlarged generally along the central line of the overlapping zone.
Laser rapid prototyping Mg-Li alloy crack mechanical properties defect residual stress (RS)
QU Zhi-ming
School of Civil Engineering, Hebei Engineering University, Handan, Hebei province, China, 056038
国际会议
北京
英文
329-337
2008-11-06（万方平台首次上网日期，不代表论文的发表时间）