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Title: In Situ TEM Nanoindentation Studies on Stress-Induced Phase Transformations in Metallic Materials

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society
 [1];  [2];  [3]
  1. Texas A & M Univ., College Station, TX (United States). Materials Science and Engineering; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology
  2. Texas A & M Univ., College Station, TX (United States). Materials Science and Engineering and Electrical and Computer Engineering
  3. Texas A & M Univ., College Station, TX (United States). Materials Science and Engineering and Mechanical Engineering

Though abundant phase transformations are in general thermally driven processes, there are many examples wherein stresses can induce phase transformations. We applied numerous in situ techniques, such as in situ x-ray diffraction and neutron diffraction in order to reveal phase transformations. Recently, an in situ nanoindentation technique coupled with transmission electron microscopy demonstrated the capability to directly correlating stresses with phase transformations and microstructural evolutions at a submicron length scale. We briefly review in situ studies on stress-induced diffusional and diffusionless phase transformations in amorphous CuZrAl alloy and NiFeGa shape memory alloy. Moreover, in the amorphous CuZrAl, in situ nanoindentation studies show that the nucleation of nanocrystals (a diffusional process) occurs at ultra-low stresses manifested by a prominent stress drop. In the NiFeGa shape memory alloy, two distinctive types of martensitic (diffusionless) phase transformations accompanied by stress plateaus are observed, including a reversible gradual phase transformation at low stress levels, and an irreversible abrupt phase transition at higher stress levels.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1304712
Report Number(s):
LA-UR-15-28427
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Vol. 68, Issue 1; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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