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Stress induced phase transformation ...

Kang, Gie Hong.

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Stress induced phase transformation in nickel-titanium shape memory alloys.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Stress induced phase transformation in nickel-titanium shape memory alloys./
Author:	Kang, Gie Hong.
Description:	120 p.
Notes:	Source: Dissertation Abstracts International, Volume: 49-05, Section: B, page: 1914.
Contained By:	Dissertation Abstracts International49-05B.
Subject:	Engineering, Metallurgy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8814866

Stress induced phase transformation in nickel-titanium shape memory alloys.
Kang, Gie Hong.

Stress induced phase transformation in nickel-titanium shape memory alloys. - 120 p.

Source: Dissertation Abstracts International, Volume: 49-05, Section: B, page: 1914.

Thesis (Ph.D.)--Michigan State University, 1988.

Stress induced martensitic transformation modes in near-equiatomic NiTi alloys have been investigated by using in-situ X-ray diffraction of samples mounted on a tensile stage. Tensile deformation studies have also been conducted to determine the stress-strain-temperature relationship in these alloys. Through differential scanning calorimetry studies, it is shown that both the martensitic start temperature, M$\sb{\rm S}$, and the premartensitic transformation temperature, T$\sb{\rm R}$, are strong functions of the thermo-mechanical history of the sample. Samples given a fixed amount of plastic deformation (30% reduction in thickness by rolling) before annealing, show a monotonic decrease in T$\sb{\rm R}$ with increasing annealing temperature up to about 600$\sp\circSubjects--Topical Terms:

1023648
Engineering, Metallurgy.

Stress induced phase transformation in nickel-titanium shape memory alloys.
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005 20110429
008 110429s1988 eng d
035 $a (UnM)AAI8814866
035 $a AAI8814866
040 $a UnM $c UnM
100 1 $a Kang, Gie Hong. $3 1254665
245 1 0 $a Stress induced phase transformation in nickel-titanium shape memory alloys.
300 $a 120 p.
500 $a Source: Dissertation Abstracts International, Volume: 49-05, Section: B, page: 1914.
502 $a Thesis (Ph.D.)--Michigan State University, 1988.
520 $a Stress induced martensitic transformation modes in near-equiatomic NiTi alloys have been investigated by using in-situ X-ray diffraction of samples mounted on a tensile stage. Tensile deformation studies have also been conducted to determine the stress-strain-temperature relationship in these alloys. Through differential scanning calorimetry studies, it is shown that both the martensitic start temperature, M$\sb{\rm S}$, and the premartensitic transformation temperature, T$\sb{\rm R}$, are strong functions of the thermo-mechanical history of the sample. Samples given a fixed amount of plastic deformation (30% reduction in thickness by rolling) before annealing, show a monotonic decrease in T$\sb{\rm R}$ with increasing annealing temperature up to about 600$\sp\circ $c . In a purer NiTi alloy, the M$\sb{\rm S}$ temperature increases monotonically with increasing annealing temperature when the samples are given the same amount of deformation (30%) before annealing. It is observed that even a small amount of impurities, influence the M$\sb{\rm S}$ temperature as well as the deformation mode. It is suggested that a strong interaction between impurities and dislocations, in these alloys, can influence the nucleation mechanism for the martensitic and the premartensitic phases. In the less purer alloy, the impurity-dislocation interaction is strong enough to produce highly localized bursts of transformations, during tensile deformation, giving rise to Luders band type of surface marking along with discontinuities in the stress-strain curve.
590 $a School code: 0128.
650 4 $a Engineering, Metallurgy. $3 1023648
690 $a 0743
710 2 0 $a Michigan State University. $3 676168
773 0 $t Dissertation Abstracts International $g 49-05B.
790 $a 0128
791 $a Ph.D.
792 $a 1988
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8814866