Indentation recovery in GdPO ₄ and observation of deformation twinning

Journal Article · Thu Sep 01 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4964356· OSTI ID:1327558

Wilkinson, Taylor M.; Musselman, Matthew A. ; Boatner, Lynn A. ; Diercks, David R.; Packard, Corinne E.

A series of nanoindentation tests on both single and polycrystalline specimens of a monazite rare-earth orthophosphate, GdPO₄, revealed frequent observation of anomalous unloading behavior with a large degree of recovery, where previously this behavior had only been observed in xenotime-structure rare-earth orthophosphates. An indentation site in the polycrystalline sample was examined using TEM to identify the deformation mechanism responsible for recovery. Finally, the presence of a twin along the (100) orientation, along with a series of stacking faults contained within the deformation site, provide evidence that the mechanism of recovery in GdPO₄ is the collapse of deformation twins during unloading.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Colorado School of Mines, Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
• Grant/Contract Number: AC05-00OR22725; DMR-1352499
• OSTI ID: 1327558
• Alternate ID(s): OSTI ID: 1327665; OSTI ID: 1420518
• Journal Information: AIP Advances, Journal Name: AIP Advances Vol. 6 Journal Issue: 9; ISSN 2158-3226
• Publisher: American Institute of Physics
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
polycrystals
hardness
nanotechnology
phase transitions
single crystals