Electron-irradiation-induced solid-state amorphization in supersaturated Ni–Zr solid solutions

Fast electron irradiation can induce the solid-state amorphization (SSA) of many intermetallic compounds. The occurrence of SSA stimulated by fast electron irradiation was found in the Al0.5TiZrPdCuNi high-entropy alloy (HEA). The relationship between the occurrence of SSA in intermetallic compounds under fast electron irradiation and the empirical alloy parameters for predicting the solid-solution-formation tendency in HEAs was discussed. The occurrence of SSA in intermetallic compounds was hardly predicted, only by the alloy parameters of δ or ΔHmix, which have been widely used for predicting solid-solution formation in HEAs. All intermetallic compounds with ΔHmix ≤ -35 kJ/mol and those with δ ≥ 12.5 exhibit the occurrence of SSA. This implies that the intermetallic compounds with a largely negative ΔHmix value and a largely positive δ parameter are favorable for the occurrence of SSA.

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High pressure solid state amorphization of Si, Ge and solid solutions Si:GaAs, Ge:GaSb

High Pressure Research ◽

10.1080/08957959408200258 ◽

1994 ◽

Vol 13 (1-3) ◽

pp. 47-49 ◽

Cited By ~ 3

Author(s):

V. V. Brazhkin ◽

A. G. Lyapin ◽

S. V. Popova ◽

R. N. Voloshin

Keyword(s):

High Pressure ◽

Solid State ◽

Solid Solutions ◽

State Amorphization

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In situ observation of solid-state amorphization in Nd2Fe14B alloy by electron irradiation

Materials Science and Engineering A ◽

10.1016/j.msea.2006.02.250 ◽

2007 ◽

Vol 449-451 ◽

pp. 1111-1114 ◽

Cited By ~ 6

Author(s):

Takeshi Nagase ◽

Akihiro Nino ◽

Yukichi Umakoshi

Keyword(s):

Solid State ◽

Electron Irradiation ◽

In Situ Observation ◽

State Amorphization

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Solid-state amorphization in a Ti2Pd intermetallic compound under fast-electron irradiation

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2013.07.078 ◽

2013 ◽

Vol 581 ◽

pp. 324-329 ◽

Cited By ~ 3

Author(s):

Satoshi Anada ◽

Takeshi Nagase ◽

Hidehiro Yasuda ◽

Hirotaro Mori

Keyword(s):

Solid State ◽

Intermetallic Compound ◽

Electron Irradiation ◽

Fast Electron ◽

State Amorphization

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Solid-state amorphization by electron irradiation

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100104376 ◽

1988 ◽

Vol 46 ◽

pp. 462-463

Author(s):

D.E. Luzzi

Keyword(s):

Solid State ◽

Intermetallic Compounds ◽

Electron Irradiation ◽

Low Temperatures ◽

Image Sequence ◽

Bright Field Image ◽

Fixed Position ◽

Bright Field ◽

State 1 ◽

State Amorphization

When certain intermetallic compounds are irradiated with ballistic electrons at low temperatures, the crystal becomes unstable and transforms into an amorphous phase. This electron irradiation induced crystalline to amorphous (C-A) transition is one of a recently discovered class of amorphization processes which occur in the solid state [1]. The relative simplicity of electron-matter interactions, and the ability to follow the transition inside the microscope, make the electron induced C-A transition ideal for the study of these amorphization processes.A bright field image sequence which depicts several features of the C-A transition is shown in the figure. In this example, CuTim was irradiated with 2 MeV electrons at 191 K (9.2 x 1023 e/m2-s; 5.5 x 10-3 dpa/s). The arrows mark a fixed position. In the images, taken after different irradiation times (a:30s, b:60s c:300s), the transition is evident from the distortion of the bend contour around the irradiated area.

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Calculation of Glass-Forming Ability in the Ni-Zr and Ni-Ti Systems from Interatomic Potentials

MRS Proceedings ◽

10.1557/proc-644-l4.2 ◽

2000 ◽

Vol 644 ◽

Author(s):

W.S. Lai ◽

B.X. Liu

Keyword(s):

Solid State ◽

Solid Solutions ◽

Amorphous State ◽

Md Simulations ◽

Interatomic Potentials ◽

Glass Forming ◽

Lindemann Criterion ◽

Amorphous States ◽

State Amorphization ◽

Amorphous Interlayer

AbstractFor the Ni-Zr and Ni-Ti systems, Molecular-dynamics (MD) simulations are conducted to compare the relative stability of the terminal solid solutions versus the corresponding amorphous states as a function of solute concentrations. It turns out that the terminal solid solutions transform into an amorphous state spontaneously when the solute concentrations are beyond the maximum allowable values, i.e. the critical solubilities, determined to be 14 at.% Zr in Ni and 25 at.% Ni in Zr for Ni-Zr system and 38 at.% Ti in Ni and 15 at.% Ni in Ti for the Ni-Ti system, respectively. The glass-forming ranges are therefore deduced to be within the respective critical solubilities, i.e. 14-75 at.% Zr and 38-85 at.% Ti for the Ni-Zr and Ni-Ti systems, respectively, which are compatible with those from experiments and/or from the generalized Lindemann criterion. Moreover, MD simulation also reveals that solid-state amorphization does take place and that the growth of the amorphous interlayer follows exactly a t½ law. Besides, a solubility criterion is proposed that the lower the maximum solid solubility the less stable is the lattice of the metal upon solid-state reaction and it can explain the fact that the growing speed of amorphous interlayer toward Ni (melting point = 1528 K) is greater than that directed to the Zr (2128 K) lattice, while it is smaller than that to Ti (1941 K) side.

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Electron-irradiation-induced solid-state amorphization caused by thermal relaxation of lattice defects

Intermetallics ◽

10.1016/j.intermet.2009.09.003 ◽

2010 ◽

Vol 18 (4) ◽

pp. 441-450 ◽

Cited By ~ 10

Author(s):

Takeshi Nagase ◽

Kazuya Takizawa ◽

Makoto Wakeda ◽

Yoji Shibutani ◽

Yukichi Umakoshi

Keyword(s):

Solid State ◽

Electron Irradiation ◽

Thermal Relaxation ◽

Lattice Defects ◽

State Amorphization

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MeV Electron Irradiation Induced Solid-State Amorphization (SSA) in B2 Intermetallic Compounds

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.62.185 ◽

2013 ◽

Vol 62 (3) ◽

pp. 185-190 ◽

Cited By ~ 2

Author(s):

Takeshi NAGASE ◽

Atsushi SASAKI ◽

Kazuya TAKIZAWA ◽

Hiroyuki YASUDA ◽

Tomoyuki TERAI ◽

...

Keyword(s):

Solid State ◽

Intermetallic Compounds ◽

Electron Irradiation ◽

State Amorphization

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A directionally-disordered precursor to amorphization in electron irradiated Cu4Ti3

Journal of Materials Research ◽

10.1557/jmr.1991.2059 ◽

1991 ◽

Vol 6 (10) ◽

pp. 2059-2068 ◽

Cited By ~ 11

Author(s):

D.E. Luzzi

Keyword(s):

Solid State ◽

Electron Irradiation ◽

Volume Expansion ◽

Structural Evolution ◽

Atomic Level ◽

Crystalline Compound ◽

Local Rotation ◽

Model Based ◽

State Amorphization ◽

Structural Disordering

Evidence of directional structural disordering prior to complete amorphization of Cu4Ti3 during 2 MeV electron irradiation is presented. It is shown that the observed disordering is intrinsic to the irradiated material and is incommensurate with the structure of the crystalline compound. The results point to the presence of significant anisotropy in the response of the material to irradiation. A model based on local rotation of clusters of atoms within a partially chemically-disordered matrix is developed. These results are discussed in relation to recent proposed mechanisms of amorphization based on volume expansion. The questions raised by this work indicate a need for detailed studies of the atomic level structural evolution of a material during solid state amorphization.

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