Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Deformation-Assisted Transformations in Nanocrystalline and Amorphous Alloys
Post: #1

In metallic alloys at room temperature, atomic diffusion is typically very sluggish, and equilibrium or metastable phases do not undergo transformations. However, during plastic deformation, significant atomic mobility is possible. In addition, deformation may lead to mixing, possibly favoring the formation of nonequilibrium phases. In this talk, two examples will be presented, in which the rate of transformation to equilibrium is enhanced by mechanical deformation. In an unstable, nanocrystalline Fe50Cu50 solid solution, ball milling leads to decomposition into the equilibrium, nearly elemental, phases. Non-monotonic effects are observed, which are attributed to the evolving mechanical properties. In amorphous Al90Fe5Gd5, bending at room temperature leads to the precipitation of Al-rich nanocrystals at shear bands. The mechanisms of this transformation are investigated using high-resolution transmission electron microscopy, nanodindentation and bending experiments. Nanovoids are observed in shear bands created under tension, when nanocrystals do not form. It is concluded that the nucleation and growth rate is significantly enhanced by the excess free volume generated in the shear bands, unless the free volume coalesces into nanovoids. The kinetics of free-volume annihilation are analyzed by observing the effect of strain rate on the resulting nanocrystallite-size distribution.

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: machinability of inconel 718 nickel based super alloys ppt, two dimensional geometric transformations by hearn and baker ppt pdf, nanocrystalline aluminum, magnesium and alloys ppt, file modules of efficient 2d grayscale morphological transformations, www amorphous, shape memory alloys applications,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  POWER ASSISTED GEAR SHIFTING MECHANISM FOR AUTOMOBILES full report project report tiger 1 7,989 25-03-2014 11:45 PM
Last Post: Guest
  shape memory alloys full report project report tiger 6 9,823 13-12-2012 02:07 PM
Last Post: seminar details
  ALUMINIUM AND ITS ALLOYS seminar class 0 1,083 23-03-2011 11:50 AM
Last Post: seminar class
  Relay Assisted MIMO Transmission System projectsofme 0 727 12-10-2010 03:59 PM
Last Post: projectsofme