Synthesis and Characterization of Nanocrystalline Ni50Al50-xMox (X=0-5) Intermetallic Compound During Mechanical Alloying Process

In  the  present  study,  nanocrystalline ni50al50-xmox  (x  =  0,  0.5,  1, 2.5,  5)  intermetallic  compound  was  produced  through  mechanical alloying  of  nickel,  aluminum,  and  molybdenum  powders.  alni compounds with good and attractive properties such as high melting point,  high  strength  to  weight  ratio  and  high  corrosion  resistance especially at high  temperatures have attracted  the attention of many researchers.  powders  produced  from  milling  were  analyzed  using scanning  electron  microscopy  (sem)  and  x-ray  diffractometry (xrd).  the  results  showed  that  intermetallic  compound  of  nial formed at different stage of milling operation. it was concluded that at  first  disordered  solid  solution  of  (ni,al)  was  formed  then  it converted  into  ordered  intermetallic  compound  of  nial.  with increasing  the  atomic  percent  of  molybdenum,  average  grain  size decreased  from  3  to  0.5  μm.  parameter  lattice  and  lattice  strain increased with  increasing  the atomic percent of molybdenum, while the  crystal  structure  became  finer  up  to  10  nm.  also,  maximum microhardness was obtained for nial49mo1 alloy.