Structure and phase stability of NiMnGa ferromagnetic shape memory alloys by experimental and ab-initio techniques
Data(s) |
01/01/2010
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Resumo |
This paper summarizes some of our recent results on crystal structure, microstructure, orientation relationship between martensitic variants and crystallographic features of martensitic transformation in Ni-Mn-Ga FSMAs. It was shown that Ni53Mn25Ga22 has a tetragonal I4/mmm martensitic structure at room temperature. The neighboring martensitic variants in Ni53Mn25Ga22 have a compound twinning relationship with the twinning elements K1={112}, K2={11-2}, η1=<11-1>, η2=<111>, P={1-10} and s=0.379. The ratio of the relative amounts of twins within the same initial austenite grain is ~1.70. The main orientation relationship between austenite and martensite is Kurdjumov-Sachs (K-S) relationship. Based on the crystallographic phenomenological theory, the calculated habit plane is {0.690 -0.102 0.716}A (5.95° from {101}A), and the magnitude, direction and shear angle of the macroscopic transformation shear are 0.121, <-0.709 0.105 0.698>A (6.04° from <-101>A) and 6.88°, respectively.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Trans Tech Publications |
Relação |
http://dro.deakin.edu.au/eserv/DU:30049004/cong-structureand-2010.pdf http://hdl.handle.net/10.4028/www.scientific.net/MSF.638-642.2040 |
Direitos |
2010, Trans Tech Publications |
Palavras-Chave | #ab initio calculations #crystal structure #ferromagnetic shape memory alloys (FSMAs) #orientation relationship #phase transformation |
Tipo |
Journal Article |