Deformation-Assisted Transformations in Nanocrystalline and Amorphous Alloys
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Computer Science Clay
Active In SP
**

Posts: 712
Joined: Jan 2009
#1
07-06-2009, 09:51 AM


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.
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
Reply

Important Note..!

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

ASK HERE

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

Quick Reply
Message
Type your reply to this message here.


Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  two advantages of power assisted steering jaseelati 0 144 17-01-2015, 02:36 PM
Last Post: jaseelati
  Deviations from Vegard’s law in ternary III-V alloys Abstract seminar projects maker 0 412 13-09-2013, 04:55 PM
Last Post: seminar projects maker
  Nonferrous Metals and Alloys: Production, General Properties, and Applications study tips 0 406 20-08-2013, 01:22 PM
Last Post: study tips
  Failure analysis of dies for aluminium alloys die-casting pdf study tips 0 414 24-06-2013, 04:25 PM
Last Post: study tips
  SHAPE MEMORY ALLOYS seminar tips 0 658 24-11-2012, 03:32 PM
Last Post: seminar tips
  shape memory alloys full report project report tiger 8 11,475 06-10-2012, 12:32 PM
Last Post: seminar flower
  ALLOYS ppt seminar flower 0 441 13-08-2012, 04:36 PM
Last Post: seminar flower
  Aluminum alloys used for spacecraft shuttle and its properties seminar ideas 0 442 04-07-2012, 03:56 PM
Last Post: seminar ideas
  xEffect of Deformation on Al-ZrO2 Particulate composites during cold upsetting seminar flower 0 420 27-06-2012, 05:19 PM
Last Post: seminar flower
  Seismic Resistance: Model Analyzes Shape-Memory Alloys Use in Earthquake-Resistant seminar flower 0 483 21-06-2012, 02:00 PM
Last Post: seminar flower