Mechanical Alloying For Ti-Mg System

Titanium alloys are widely used in aerospace applications because of their high strength to weight ratio and good corrosion resistance.Reducing density is the most effective way of reducing the weight of structural components and for Ti alloys are attractive materials in aerospace and automobile industries mainly because of their low densities and high specific resistance.Nevertheless,their use has been limited because of their poor corrosion resistance and mechanical properties.It has been observed that this resistance and properties can be improved by alloying with titanium.Therefore,Ti-Mg system alloys have synthesized by Mechancal alloying method in this paper.Mechancal alloying(MA) is a ball milling process where pure element powders or mixture powders placed in the ball mill is subjected to high energy collision ,milling from the balls and solid state reaction takes place .For pure element powders ,this process is also called Mechanical Milling (MM) or Mechanical Grinding(MG).Up to now ,MA is the most economic way to manufacture materials among all the way .The technology has been used to prepare dispersion strengthening, supersaturated solid solution, intermetallic compound, quasicrystalline, nanocrystalline materials and functional materials such as magnetism, superconductor.This paper mainly focuses on the effect of ball milling parameters such as milling time, milling speed, the ratio of milling ball and material on the process of Ti-Mg alloy prepared by mechanical alloying. The XRD, SEM ,TEM are used to character the process of Ti-Mg mechanical alloying, and to establish the quantitative relationships of the crystal lattice constant variety of Ti at different milling condition, and the diffraction intensity of Ti at the different milling condition, and the surface morphology of Ti -Mg powder at different milling condition.The process of Ti-Mg mechanical alloying is affected by the milling time. The diffraction intensity of Ti and Mg declined greatly with the increase of milling time. The crystal lattice constant variety of Ti is proportional to the milling time. But after some time of milling, the process has been finished and then an increase in the milling time has little effect on the process of mechanical alloying.The process of Ti-Mg mechanical alloying is affected by the raw material ratio. The diffraction intensity of Ti declined greatly with the increase of raw material ratio.The crystal lattice constant variety of Ti is proportional to the milling time.The ratio of milling ball and materical is a very important factor in the process of Ti-Mg alloying prepared by mechanical alloying. The diffraction intensity of Ti is inverse measurement of the milling ball and material ratio.