Size dependent phase transformation in atomized TiAl powders

2015 ◽  
Vol 61 ◽  
pp. 72-79 ◽  
Author(s):  
Dong-Ye Yang ◽  
Shu Guo ◽  
Hua-Xin Peng ◽  
Fu-Yang Cao ◽  
Na Liu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Size Dependent

scholarly journals Size-dependent Phase Transformation and Fracture of ZnO Nanowires

2017 ◽  
Vol 21 ◽  
pp. 86-93
Author(s):  
Jianying He ◽  
Jianyang Wu ◽  
Shijo Nagao ◽  
Lijie Qiao ◽  
Zhiliang Zhang
Keyword(s):  
Phase Transformation ◽  
Zno Nanowires ◽  
Size Dependent

Size-dependent solution-mediated phase transformation of piroxicam monohydrate particles

CrystEngComm ◽  
2021 ◽  
Vol 23 (16) ◽  
pp. 2928-2932
Author(s):  
Changlin Yao ◽  
Lei Wang ◽  
Xinyuan Wang ◽  
Xutang Tao
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Size Dependent

The transformation from the piroxicam monohydrate to form I or form II could be achieved precisely by adjusting the particle size itself in the 99% acetone-1% H2O solvent at 31 °C.

scholarly journals Size-Dependent Phase Transformation during Gas Atomization Process of Cu–Sn Alloy Powders

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 245 ◽  
Author(s):  
Hao Pan ◽  
Hongjun Ji ◽  
Meng Liang ◽  
Junbo Zhou ◽  
Mingyu Li
Keyword(s):  
Phase Transformation ◽  
Nucleation Theory ◽  
Gas Atomization ◽  
Atomization Process ◽  
Cu6sn5 Phase ◽  
Lotus Leaf ◽  
Threshold Size ◽  
Size Dependent ◽  
Droplet Sizes ◽  
Transient Nucleation

For binary element atomization, it is essential to investigate the phase transformation from liquid to solid as a functions of the droplet sizes, as well as the reaction competitiveness, during gas atomizing solidification of their nuclei. In the present work, a series of phase transformations of undercooled Cu (60.9 wt.%)/Sn droplets were analyzed when atomized by pressure gas. The results indicated that the microstructures of the obtained powders and their morphologies were highly relevant to the droplet size. According to the phase characteristics analyzed by the microstructural observations in combination with the transient nucleation theory, powders with sizes from 10 to 100 μm were divided into three categories, exhibiting lotus-leaf, island, and stripe morphologies. The competitive formation of Cu6Sn5 or Cu3Sn was also controlled by the droplet sizes, and a diameter of approximately 45 μm was identified as the threshold size. After heat treatment at 300 °C for 4 h, the powders consisted of a single η’ Cu6Sn5 phase. The obtained Cu6Sn5 phase powders can be used in the field of high-temperature applications as intermetallic balls for integrated chip interconnects.

Size‐Dependent Phase Transformation of Noble Metal Nanomaterials

Small ◽  
2019 ◽  
Vol 15 (41) ◽  
pp. 1903253 ◽  
Author(s):  
Faisal Saleem ◽  
Xiaoya Cui ◽  
Zhicheng Zhang ◽  
Zhongqiang Liu ◽  
Jichen Dong ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Noble Metal ◽  
Size Dependent ◽  
Metal Nanomaterials

Size-Dependent Anatase to Rutile Phase Transformation and Particle Growth

2012 ◽  
Vol 25 (8) ◽  
pp. 1408-1415 ◽  
Author(s):  
Kairat Sabyrov ◽  
Nathan D. Burrows ◽  
R. Lee Penn
Keyword(s):  
Phase Transformation ◽  
Particle Growth ◽  
Rutile Phase ◽  
Size Dependent

Bidirectional tuning of phase transition properties in Pt : VO2 nanocomposite thin films

Nanoscale ◽  
2020 ◽  
Vol 12 (34) ◽  
pp. 17886-17894
Author(s):  
Zihao He ◽  
Jie Jian ◽  
Shikhar Misra ◽  
Xingyao Gao ◽  
Xuejing Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Phase Transformation ◽  
Work Function ◽  
Size Dependent ◽  
Nanocomposite Thin Films

Pt : VO2 nanocomposite design to achieve bidirectional tuning of phase transformation via size dependent work function of nanoparticles.

Phase transformation of nanocrystalline anatase-to-rutile via combined interface and surface nucleation

2000 ◽  
Vol 15 (2) ◽  
pp. 437-448 ◽  
Author(s):  
Hengzhong Zhang ◽  
Jillian F. Banfield
Keyword(s):  
Phase Transformation ◽  
Particle Packing ◽  
X Ray Diffraction ◽  
Dense Particle ◽  
Free Surfaces ◽  
Size Dependent ◽  
Surface Nucleation ◽  
Bulk Nucleation ◽  
Alumina Particles ◽  
Kinetics Of

The kinetics of phase transformation of nanocrystalline anatase samples was studied using x-ray diffraction at temperatures ranging from 600 to 1150 °C. Kinetic data were analyzed with an interface nucleation model and a newly proposed kinetic model for combined interface and surface nucleation. Results revealed that the activation energy of nucleation is size dependent. In anatase samples with denser particle packing, rutile nucleates primarily at interfaces between contacting anatase particles. In anatase samples with less dense particle packing, rutile nucleates at both interfaces and free surfaces of anatase particles. The predominant nucleation mode may change from interface nucleation at low temperatures to surface nucleation at intermediate temperatures and to bulk nucleation at very high temperatures. Alumina particles dispersed among the anatase particles can effectively reduce the probability of interface nucleation at all temperatures.

scholarly journals Two-phase equilibrium states in individual Cu–Ni nanoparticles: size, depletion and hysteresis effects

2015 ◽  
Vol 6 ◽  
pp. 1811-1820 ◽  
Author(s):  
Aram S Shirinyan
Keyword(s):  
Phase Diagram ◽  
Phase Transformation ◽  
Phase Equilibrium ◽  
Size Effects ◽  
Solubility Diagram ◽  
Two Phase ◽  
Nanoscale Systems ◽  
First Order ◽  
Size Dependent ◽  
First Order Phase

In isolated bimetallic nanoscale systems the limit amount of matter and surface-induced size effects can change the thermodynamics of first-order phase transformation. In this paper we present theoretical modification of Gibbs free energy concept describing first-order phase transformation of binary alloyed nanoparticles taking into account size effects as well as depletion and hysteresis effects. In such a way the hysteresis in a form of nonsymmetry for forth and back transforming paths takes place; compositional splitting and the loops-like splitted path on the size dependent temperature–composition phase diagram occur. Our calculations for individual Cu–Ni nanoparticle show that one must differentiate the solubility curves and the equilibrium loops (discussed here in term of solidification and melting loops). For the first time we have calculated and present here on the temperature–composition phase diagram the nanomelting loop at the size of 80 nm and the nanosolidification loop at the size of 25 nm for an individual Cu–Ni nanoparticle. So we observe the difference between the size-dependent phase diagram and solubility diagram, between two-phase equilibrium curves and solubility curves; also intersection of nanoliquidus and nanosolidus is available. These findings lead to the necessity to reconsider such basic concepts in materials science as phase diagram and solubility diagram.

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