TY - JOUR
T1 - The simple hexagonal to β-Sn martensitic transition in Sn-(7.0-9.5) at.% in alloys
AU - Koyama, Y.
AU - Suzuki, H.
N1 - Funding Information:
1. Thes impleh exagonatl o /I-Sn martensitict ran-ProfessorT . Mori for a numbero f usefulc ommentso n the Acknowledgements-The authorsw ould like to thank sition found in Sn-(7&9.5) at.% In alloys is at ypical manuscript.T his work was partially supported by a first-ordert ransition and its transition temperatures Grant-in-Aid for FundamentaSl cientificR esearchfr om the decreasew ith increasingI n content. Ministry of Education, Sciencea nd Culture (57350045), 2. Not only thin platem artensitesb ut also lenticu-Japan. lar martensitesa re formed in the 8-G martensite phase.I n addition, a cycleo f forward-reversetr ansi- tions producesn ew surface reliefs which have not existedb eforet he cycle.T hat is, the transitioni s not completelyr eversiblew ith respectt o atomic move- ments. 3. The orientation relationship,( OOOI),,1, ()l oo),,, and [727%I.IW ]I,M~, has been found experi- mentally.O n the basis of this result, the model for atomicd isplacementisn the transition has beenp ro- posed.T he displacementisn the proposemd odelc an be regardeda s transversew aves with polarization vectorsp arallelt o (TzTo), ,,, , propagatingp erpendic- ular to the {lOTI},, plane.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 1989/2
Y1 - 1989/2
N2 - Crystallography, martensite morphology, surface relief and shape memory effect in a simple hexagonal to β-Sn martensitic transition of Sn-(7.0-9.5) at.% In alloys have been investigated. The structure of β-Sn martensite consists of thin and lenticular plates. New surface reliefs appear on the reverse transition after the forward transition; that is, incomplete reversibility of the atomistic sequence of the transition has been found. Correspondingly, the degree of a shape memory effect is small. The orientation relationship between the simple hexagonal and β-Sn structures, (0001)s.h.//(100)β-Sn and [1̄21̄0]s.h.//[001]β-Sn, has been determined. From these results, the mechanism for the martensitic transition has been proposed; simple atomic displacements corresponding to 1 2 〈101̄1〉 transverse phonons with polarization vectors along the 〈1̄21̄0〉 directions induce the transition. This mechanism predicts the formation of three types of transformation twins constituting substructures and can explain the incomplete crystallographic reversibility of the transition.
AB - Crystallography, martensite morphology, surface relief and shape memory effect in a simple hexagonal to β-Sn martensitic transition of Sn-(7.0-9.5) at.% In alloys have been investigated. The structure of β-Sn martensite consists of thin and lenticular plates. New surface reliefs appear on the reverse transition after the forward transition; that is, incomplete reversibility of the atomistic sequence of the transition has been found. Correspondingly, the degree of a shape memory effect is small. The orientation relationship between the simple hexagonal and β-Sn structures, (0001)s.h.//(100)β-Sn and [1̄21̄0]s.h.//[001]β-Sn, has been determined. From these results, the mechanism for the martensitic transition has been proposed; simple atomic displacements corresponding to 1 2 〈101̄1〉 transverse phonons with polarization vectors along the 〈1̄21̄0〉 directions induce the transition. This mechanism predicts the formation of three types of transformation twins constituting substructures and can explain the incomplete crystallographic reversibility of the transition.
UR - http://www.scopus.com/inward/record.url?scp=0024611574&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0024611574&partnerID=8YFLogxK
U2 - 10.1016/0001-6160(89)90243-5
DO - 10.1016/0001-6160(89)90243-5
M3 - Article
AN - SCOPUS:0024611574
VL - 37
SP - 597
EP - 602
JO - Acta Materialia
JF - Acta Materialia
SN - 1359-6454
IS - 2
ER -