Structural evolution and mechanism of strain glass transition in Ti48.7Ni51.3 shape memory alloy studied by anomalous small-angle X-ray scattering.

Scientific Reports
Yung-Chien HuangShyi-Kaan Wu

Abstract

The in-situ anomalous small-angle X-ray scattering (ASAXS) technique was used to investigate the strain glass transition (SGT) in as-quenched Ti48.7Ni51.3 shape memory alloy during a thermal cycle of 30 °C to the SGT temperature Tg (-50 °C) and then to 30 °C again. The Ni atoms play a critical role as point defects in the SGT mechanism and are very difficult to characterize using conventional tools. ASAXS identified the distribution of Ni atoms in nanodomains, which have a disk-like core-shell configuration with a Ni-rich shell and a highly Ni-rich core. Moreover, the morphological evolution, growth and shrinkage of the highly Ni-rich core domains during the thermal cycle through Tg are demonstrated. The enhancement and reversible behavior of the local lamellar ordering arrangement of nanodomains during the SGT process at Tg are revealed. The structural evolution and local ordering arrangement of nanodomains can play a role in hindering martensitic transformation. The ASAXS results provide new knowledge about the SGT beyond that from current simulation works. However, this corresponding structure of the nanodomains was destroyed when the specimen was heated to 250 °C.

References

Dec 31, 2005·Physical Review Letters·Shampa SarkarKazuhiro Otsuka
Dec 13, 2006·Physical Review Letters·Yu WangKazuhiro Otsuka
Jun 4, 2008·Physical Review Letters·Pol LloverasAvadh Saxena
Jan 15, 2011·Physical Review Letters·Dong WangXiaobing Ren
Feb 7, 2014·Scientific Reports·Yu WangJianrong Gao

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Methods Mentioned

BETA
SMAs
X-ray
transmission electron microscopy
SANS
atomic scattering

Software Mentioned

ASAXS

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