Investigation on Microstructure and Phase Transformation of La Added Ti49.3Ni50.7 Shape Memory Alloy

2012 ◽  
Vol 557-559 ◽  
pp. 1041-1044 ◽  
Author(s):  
Jia Wen Xu ◽  
Ai Lian Liu ◽  
Bing Yu Qian ◽  
Wei Cai
Keyword(s):  
Phase Transformation ◽  
Room Temperature ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Ni Alloys ◽  
Ni Alloy ◽  
The Matrix ◽  
La Addition

The effect of La addition on the microstructure and phase transformation behavior of Ti 49.3Ni50.7 alloy is investigated by optical microscope (OP), scanning electron microscope (SEM), X-ray diffraction analysis (XRD) and differential scanning calorimeter (DSC). The results show that the microstructure of Ti-Ni alloy is changed obviously with La addition, and the microstructure of Ti-Ni alloy containing La at room temperature is made up of the matrix and LaNi phase. La addition firstly increases the martensitic transformation temperatures evidently and the increase of Ms is about 62°C with 1at.% La. Secondly Adding La changes the type of phase transformation behavior of Ti-Ni alloys, and R phase transformation with Rs temperature about room temperature occurs in La added Ti-Ni alloy.

Phase Transformation Behavior and Stability of LiNiO 2 Cathode Material for Li‐Ion Batteries Obtained from In Situ Gas Analysis and Operando X‐Ray Diffraction

ChemSusChem ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2240-2250 ◽  
Author(s):  
Lea de Biasi ◽  
Alexander Schiele ◽  
Maria Roca‐Ayats ◽  
Grecia Garcia ◽  
Torsten Brezesinski ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Cathode Material ◽  
Gas Analysis ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
X Ray ◽  
Phase Transformation Behavior ◽  
Li Ion

Phase transformation behavior in Ti-Ni alloy ribbons fabricated by melt spinning

2003 ◽  
Vol 112 ◽  
pp. 893-896 ◽  
Author(s):  
T.-H. Nam ◽  
J.-H. Kim ◽  
M.-S. Choi ◽  
H.-W. Lee ◽  
Y.-W. Kim
Keyword(s):  
Phase Transformation ◽  
Melt Spinning ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Ni Alloy

scholarly journals Effect of Sn Addition on Phase Transformation Behavior of Equiatomic Ni-Ti Shape Memory Alloy

2020 ◽  
Vol 17 (3(Suppl.)) ◽  
pp. 0961
Author(s):  
Ali Abadi Aljubouri ◽  
Safa hasan Mohammed ◽  
Mudhafar ali Mohammed
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Optical Microscope ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Micro Hardness ◽  
Transformation Behavior ◽  
Scanning Calorimetry ◽  
Phase Transformation Behavior

Sn effect on the phase transformation behavior, microstructure, and micro hardness of equiatomic Ni-Ti shape memory alloy was studied. NiTi and NiTiSn alloys were produced using vacuum induction melting process with alloys composition (50% at. Ni, 50% at.Ti) and (Ni 48% at., Ti 50% at., Sn 2% at.). The characteristics of both alloys were investigated by utilizing Differential Scanning Calorimetry, X- ray Diffraction Analysis, Scanning Electron Microscope, optical microscope and vicker's micro hardness test. The results showed that adding Sn element leads to decrease the phase transformation temperatures evidently. Both alloy samples contain NiTi matrix phase and Ti2Ni secondary phase, but the Ti2Ni phase content decreases with Sn addition and this is one of the reasons that leads to decrease the micro hardness of alloy with adding Sn element in a noticeable manner. The micro hardness decreases from 238.74 for NiTi equiatomic alloy to 202 for NiTiSn alloy after heat treatment.

Co-Deposition of Al–Ni Alloy in NiCl2-AlCl3-1-ethyl-3-methylimidazolium Bromide ([EMIM]Br) Ionic Liquid

2011 ◽  
Vol 121-126 ◽  
pp. 65-69
Author(s):  
Li Peng Zhang ◽  
Xian Jin Yu ◽  
Zhi Wei Ge ◽  
Yun Hui Dong ◽  
Dang Gang Li
Keyword(s):  
Electron Microscopy ◽  
Ionic Liquid ◽  
Room Temperature ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ni Alloys ◽  
Ni Alloy ◽  
Rapidly Solidified ◽  
Scanning Electron

Al-Ni Alloys were obtained from NiCl2-AlCl3-1-ethyl-3-methylimidazolium bromide ([EMIM]Br) ionic liquid at room temperature. The analysis of Al-Ni alloys that co-deposited at different potentials for 2h were performed using Scanning Electron Microscopy (SEM) and X-ray diffraction analysis (XRD). It appears that Ni has been rapidly solidified in the alloys and homogeneous Al-Ni alloys can be obtained at room temperature. As increasing the overpotential, the amount of Ni in the alloys was decreased whereas the amount of Al was increased. The chloride pitting potentials of alloys with the molar ratio of NiCl2/AlCl3/[EMIM]Br 0.03:2:1 was approximately 0.3 V more than pure Al.

X-Ray Diffraction Studies on Ti-Pd Shape Memory Alloys

2014 ◽  
Vol 783-786 ◽  
pp. 2517-2522
Author(s):  
Raju Arockiakumar ◽  
Madoka Takahashi ◽  
Satoshi Takahashi ◽  
Yoko Yamabe-Mitarai
Keyword(s):  
Phase Transformation ◽  
Shape Memory ◽  
Low Temperatures ◽  
Periodic Table ◽  
Room Temperature ◽  
Group Iv ◽  
X Ray Diffraction ◽  
Transformation Behavior ◽  
X Ray ◽  
B2 Phase

The phase transformation behavior of Ti-50Pd-5x (x =Zr, Hf, V, Nb, Ta, Cr, Mo, W) (at.%) alloys was studied by X-ray diffraction measurements from room temperature to 800 oC. In all the alloys, B19 martensite was observed at room temperature and it transformed to B2 phase upon heating. In addition, peaks corresponding to formation of (Ti, x)2Pd3 phase was seen for all the alloys. However, the temperature of formation of (Ti, x)2Pd3, interestingly, varied with respect to the elements group from the periodic table. Elements except from group IV (Zr and Hf) have been identified to accelerate the formation of (Ti, x)2Pd3 phase even at low temperatures (~400 oC).

A Study on the Phase Transformation Behavior and Characteristics of BaTi1-X(Li2/3 Nb2/3 )XO3 Solid Solution

2011 ◽  
Vol 279 ◽  
pp. 66-70
Author(s):  
Peng Wu ◽  
Jing Ji Zhang ◽  
Li Na Sun ◽  
Jing Tao Liu ◽  
Huang Zhou ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Room Temperature ◽  
Ferroelectric Phase ◽  
Paraelectric Phase ◽  
Perovskite Phase ◽  
Frequency Dispersion ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Dielectric Peak ◽  
Temperature State

Microstructure, phase transformation behavior and electrical properties of BaTi1-x(Li2/3Nb2/3)xO3 with x=0.01-0.40 ceramics have been investigated. Only perovskite phase is detected for all the compositions. The room temperature state of BaTi1-x(Li2/3Nb2/3)xO3 ceramics experiences a transformation from a ferroelectric phase to a paraelectric phase with increasing x. Meanwhile, the permittivity of BaTi1-x(Li2/3Nb2/3)xO3 ceramics reduces, while the Q×f value increases. A degree of frequency dispersion of dielectric peak is obviously increased as x increases from 0.01 to 0.10. It is of great interest that a dielectric abnormity represented by a broad dielectric peak at 200-400K is observed for the composition with x=0.40.

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