scholarly journals Coexistence of exchange bias and memory effect in nanocrystalline CoCr2O4

2022 ◽  
Vol 890 ◽  
pp. 161916
Author(s):  
S. Goswami ◽  
P. Gupta ◽  
S. Bedanta ◽  
M. Chakraborty ◽  
D. De
Keyword(s):  
2012 ◽  
Vol 101 (14) ◽  
pp. 142401 ◽  
Author(s):  
R. Pradheesh ◽  
Harikrishnan S. Nair ◽  
V. Sankaranarayanan ◽  
K. Sethupathi

Author(s):  
G. M. Michal

Several TEM investigations have attempted to correlate the structural characteristics to the unusual shape memory effect in NiTi, the consensus being the essence of the memory effect is ostensible manifest in the structure of NiTi transforming martensitic- ally from a B2 ordered lattice to a low temperature monoclinic phase. Commensurate with the low symmetry of the martensite phase, many variants may form from the B2 lattice explaining the very complex transformed microstructure. The microstructure may also be complicated by the enhanced formation of oxide or hydride phases and precipitation of intermetallic compounds by electron beam exposure. Variants are typically found in selfaccommodation groups with members of a group internally twinned and the twins themselves are often observed to be internally twinned. Often the most salient feature of a group of variants is their close clustering around a given orientation. Analysis of such orientation relationships may be a key to determining the nature of the reaction path that gives the transformation its apparently perfect reversibility.


Author(s):  
F. I. Grace

An interest in NiTi alloys with near stoichiometric composition (55 NiTi) has intensified since they were found to exhibit a unique mechanical shape memory effect at the Naval Ordnance Laboratory some twelve years ago (thus refered to as NITINOL alloys). Since then, the microstructural mechanisms associated with the shape memory effect have been investigated and several interesting engineering applications have appeared.The shape memory effect implies that the alloy deformed from an initial shape will spontaneously return to that initial state upon heating. This behavior is reported to be related to a diffusionless shear transformation which takes place between similar but slightly different CsCl type structures.


2007 ◽  
Author(s):  
David Marshall ◽  
Paul Atchley

2011 ◽  
Author(s):  
Jason Swift ◽  
Andrew Garcia ◽  
Maura Pilotti ◽  
Salif Mahamane ◽  
Jennifer Almand

2003 ◽  
Vol 112 ◽  
pp. 1177-1180 ◽  
Author(s):  
A. Schuster ◽  
H. F. Voggenreiter ◽  
D. C. Dunand ◽  
G. Eggeler

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