Corrigendum to “Effect of thermal cycling on the shape memory transformation behavior of NiTi alloy: Powder X-ray diffraction study” [Mater. Sci. Eng. A. 448 (2007) 33–38]

2009 ◽  
Vol 505 (1-2) ◽  
pp. 191 ◽  
Author(s):  
Manjunatha Pattabi ◽  
K. Ramakrishna ◽  
K.K. Mahesh
Keyword(s):  
Thermal Cycling ◽  
Shape Memory ◽  
Diffraction Study ◽  
Alloy Powder ◽  
Niti Alloy ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
X Ray

Transformation Behavior and Shape Memory Characteristics of Ti-45Ni-5Cu(at%) Alloy Ribbons Fabricated by Melt Spinning

2004 ◽  
Vol 449-452 ◽  
pp. 1093-1096 ◽  
Author(s):  
Tae Hyun Nam ◽  
Jae Hwa Lee ◽  
Tae Yeon Kim ◽  
Yeon Wook Kim
Keyword(s):  
Shape Memory ◽  
Melt Spinning ◽  
Constant Load ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
X Ray ◽  
Density Of Dislocations ◽  
Large Lattice ◽  
One Step ◽  
Memory Characteristics

Transformation behaviors and shape memory characteristics of Ti-45Ni-5Cu alloy ribbons fabricated by melt spinning were investigated by means of optical microscopy, differential scanning calorimetries(DSC), X-ray diffraction and thermal cycling tests under constant load. They depended largely on temperatures of liquid metal. The B2-B19-B19’ two-step transformation occurred in the ribbons fabricated with the liquid whose temperature was higher than 1723 K, while the B2-B19’ one-step transformation occurred in the ribbons with the liquid at 1673 K. The stabilization of the B19 martensite in Ti-45Ni-5Cu alloy ribbons was ascribed to the high density of dislocations which made strong resistance to large lattice deformation associated with a formation of the B19’ martensite.

X-Ray Diffraction Study of Shape Memory in Uranium-Niobium Alloys

1982 ◽  
Vol 26 ◽  
pp. 307-312 ◽  
Author(s):  
D. A. Carpenter ◽  
R. A. Vandermeer
Keyword(s):  
Shape Memory ◽  
Diffraction Study ◽  
Strain Curve ◽  
X Ray Diffraction ◽  
Stress Strain Curve ◽  
Niobium Alloys ◽  
X Ray ◽  
Scan Time ◽  
Diffraction Patterns

An x-ray diffraction study of the reversible deformation inodes associated with the shape memory effect has been carried out on a series of uranium-niobium alloys near the monotectoid composition (6.2 wt. % Nb). Diffraction patterns were measured as a function of strain, in situ, while the specimens were under stress as part of an attempt to explain the “easy-flow”, low-strain plateau in the stress-strain curve. The alloys, consisting of highly twinned, metastable α” (monoclinic) and γ° (tetragonal) phases derived from the high-temperature BCC γ phase, produced broad, overlapping diffraction lines difficult to analyze by conventional techniques. One solution to this problem was to use a segmented step-scan technique so as to apportion the scan time to concentrate on the most difficult regions. This paper discusses data obtained from an α” alloy and a dual-phase α” + γ° alloy.

Effect of Thermal Cycling on Transformation Behavior of Ti–24Nb–1Mo Alloy (at.%)

2020 ◽  
Vol 20 (11) ◽  
pp. 6792-6796
Author(s):  
Jin-Hwan Lim ◽  
Mi-Seon Choi ◽  
Tae-Hyun Nam
Keyword(s):  
Electrical Resistivity ◽  
Martensitic Transformation ◽  
Thermal Cycling ◽  
Volume Fraction ◽  
Resistivity Measurement ◽  
Electrical Resistivity Measurement ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
Thermally Induced ◽  
X Ray

The effect of thermal cycling on the transformation behavior of a Ti–24Nb–1Mo alloy was investigated by means of electrical resistivity measurement, transmission electron microscopy (TEM), X-ray diffraction (XRD), tensile test and Vickers hardness tests. Electrical resistivity changes were not observed in all alloys. It indicates that thermally induced martensitic transformation does not take place in the alloys. After thermal cycling between 298 K and 77 K, clear X-ray diffraction peaks corresponding to ωath phase, which did not exist before thermal cycling, were observed. Volume fraction of ωath phase increased as increasing the number of thermal cycling. ωath phase formed during thermal cycling increased hardness of the alloy. Although thermally induced martensitic transformation did not occur in the alloys, superelastic deformation behavior was observed in the alloys. The superelastic recovery ratio decreased from 81% to 41% by increasing the number of thermal cycling, which came from the increase in the volume fraction of ωath phase.

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