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Title: In-situ HRTEM observations of intermediate phase transformation in lattice reorientation in HCP rhenium

Journal Article · · Journal of Materials Science and Technology
 [1];  [1]; ORCiD logo [2];  [3];  [1]
  1. Univ. of Pittsburgh, PA (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

In-situ high-resolution transmission electron microscopy (HRTEM) is performed to investigate the deformation behavior of hexagonal close-packed rhenium (Re) which is compressed along the $$\langle1\overline{1}00\rangle$$ direction. Atomistic simulations are also conducted to better understand the deformation mechanisms. Two types of lattice reorientation are observed during compression. The first type involves the reorientation of one lattice by ~90° around $$\langle1\overline{1}00\rangle$$, which is accomplished by the formation of an intermediate face-center-cubic (FCC) phase at the interface. This transformation sequence can be described as {$$1\overline{1}00$$}matrix → {$111$}FCC → ($0001$$)twin. In the second type, a new grain is formed but does not satisfy any known twin relationship with the matrix, and an intermediate FCC phase is also formed. The transformation sequence can be described as {$$1\overline{1}00$$}matrix → {$$111$}FCC → ($0001$)grain. Mechanisms responsible for the observed lattice reorientation and sequential phase transitions are analyzed by conducting lattice correspondence analyses on the simulation results. Strain accommodation is also analyzed to explain the mechanisms for lattice reorientation and the intermediate phase transformations. In conclusion, the results provide new insight into the deformation behavior of HCP metals

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2446682
Report Number(s):
PNNL-SA--162856
Journal Information:
Journal of Materials Science and Technology, Journal Name: Journal of Materials Science and Technology Journal Issue: 1 Vol. 206; ISSN 1005-0302
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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