THE R-PHASE TRANSITION AND ASSOCIATED SHAPE MEMORY MECHANISM IN TI-NI SINGLE-CRYSTALS

被引：172

作者：

MIYAZAKI, S

WAYMAN, CM

机构：

[1] UNIV ILLINOIS,DEPT MAT SCI,URBANA,IL 61801

[2] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801

来源：

ACTA METALLURGICA | 1988年 / 36卷 / 01期

关键词：

The shapem emorym echanism associwatiethdt he R-phaset ransitionin Ti-Ni type alloys has been clarifiedu sing Ti-Nis inglec rystalsC. onclusionasr e as follows: 1. A specificc ross-markemdo rphologcyo nsisting of thef our typeso f R-phasev ariantsis formedu pon cooling beloTwR p oint.T his combinatioonf thef our variantsp roducesa zero shape-changien; d icating that this specificm orphologyis the resulto f self-accommodation. 2. Six inning planesin eachv ariantw ered eter-minedu singt wo-surfacaen aiysias ndw eref oundt o consisot f three{ 1 l o} andt hree{ 1 00)p lanesw; hich arec ompoundtw ins. 3. By stressingth; em ostf avorableR -phasev ari-ant was formedf rom the remainingv ariantsb y twinningd eformationT.h e most favorablev ariant givesm aximumst raina longt het ensilea xis.T het hus attaineds inglev ariantc onditionr emainsa fter the load is removed. 4. Upon heating; m ost of the shaper ecovery occursi n a secondo rder manneru p to Ta point whichs ignifietsh es tructuraclh angeo f the R-phase unitc ell.T he shapere coveryp rocesiss substantially differentfr om that associatewd ith the martensitic ~ansfo~ationF. inally; the R-phaset ransformtso thep arentp hasea bovet he TR point; r esultingin a perfects haper ecovery. Acknowietfgemenrsw-Tohriks was supportebdy the NationalS cience Foundation; through the Materials ResearchL aboratory at the University of Ilfinois; Grant NSF DMR 83-16981T.h e alloys were kindly providedb y the Furukawa Electric Co; Tokyo; Japan;

D O I：

10.1016/0001-6160(88)90037-5

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

引用

页码：181 / 192

页数：12

共 12 条

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