Binary And Ternary Amorphous Alloys of Ion-Implanted Fe-Ti-C

1985 ◽  
Vol 51 ◽  
Author(s):  
D. M. Follstaedt ◽  
J. A. Knapp
Keyword(s):  
Mechanical Properties ◽  
Amorphous Phase ◽  
Phase Formation ◽  
Ion Irradiation ◽  
Lattice Structure ◽  
Ion Beam ◽  
Iron Carbide ◽  
Complete Characterization ◽  
Amorphous Phases ◽  
Amorphous Phase Formation

ABSTRACTThe microstructure of Fe implanted with up to 50 at.% C was found to consist of hexagonal iron carbide precipitates oriented with respect to the Fe matrix. For higher C concentrations, an amorphous phase forms. This concentration dependence is explained in terms of the lattice structure of the iron carbide. In Ti-implanted Fe, substitutional Ti was found in the bcc Fe lattice for concentrations ≤ 15 at.% Ti. The work of others suggests that amorphous phases form for ≥ 33 at.% Ti. These results are discussed in terms of concentration boundaries of the ternary Fe(Ti,C) amorphous phase.Ion beam alloying methods are currently being used to form metastable alloys [1], both for fundamental investigations of such alloys as well as for potential use to improve physical properties of components [2]. An important consideration in metal alloys is what phase will form upon implantation; one aspect of this question is to determine when amorphous phases will form. Rules are currently being advanced to predict alloy systems which will yield amorphous phases. By using ion irradiation and ion beam mixing as well as ion implantation, such rules can be evaluated over entire composition ranges.To gain insight into amorphous phase formation, we have studied Fe alloys implanted with C, Ti and Ti + C. The Fe(C) alloys exhibit compound precipitation and amorphous phase formation; the precipitation and the concentrations at which the amorphous phase appears can be accounted for by considerations of the structure of the hexagonal carbide which forms. Based on conventional uses of the Fe(C) system, such alloys may be useful for improving mechanical properties by implanting C into ferrous components. Iron implanted with Ti is examined to a limited extent here, but by including ion irradiation studies by others [3], a more complete characterization of Fe(Ti) alloys is obtained. The microstructures of Fe(C) and Fe(Ti) are examined along with the known composition limits of amorphous Fe(Ti,C) alloys, which are important for their improved mechanical properties [2]. Taken together, a more complete determination of amorphous phase formation in this ternary system is obtained.

Solid solution or amorphous phase formation in Al-Mo alloyed films and their mechanical properties

2018 ◽  
Vol 746 ◽  
pp. 77-83 ◽  
Author(s):  
Caixia Wang ◽  
Tao Wang ◽  
Linlin Cao ◽  
Guoqing Wang ◽  
Guojun Zhang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Amorphous Phase ◽  
Phase Formation ◽  
Amorphous Phase Formation

Dynamic Annealing and Amorphous Phase Formation in Si, GaAs and AlGaAs Under Ion Irradiation

1993 ◽  
Vol 316 ◽  
Author(s):  
J.S. Williams ◽  
H.H. Tan ◽  
R.D. Goldberg ◽  
R.A. Brown ◽  
C. Jagadish
Keyword(s):  
Dose Rate ◽  
Amorphous Phase ◽  
Phase Formation ◽  
Ion Irradiation ◽  
Critical Regime ◽  
Extended Defects ◽  
Defect Annealing ◽  
Ion Damage ◽  
Residual Damage ◽  
Amorphous Phase Formation

ABSTRACTIon damage processes and amorphous phase formation are compared in Si, GaAs and Alx Ga1-x As materials in the critical regime where dynamic defect annealing is strongly competing with ion damage production. It is shown that the nature of residual damage is very strongly dependent on temperature, ion dose and dose rate in this critical regime for both Si and GaAs and that the amorphous phase can be “nucleated” by high levels of extended defects. In Alx Ga1-x As, the amorphous phase is increasingly more difficult to nucleate with increasing Al concentration at LN2 temperature but can be nucleated at sufficiently high implantation doses for all Al concentrations. No dose rate effect is observed for Alx Ga1-x As. This behaviour is discussed in terms of the availability of mobile defects and bonding configurational changes during irradiation.

Amorphous Phase Formation and Recrystallization in Ion-Implanted Silicides

1983 ◽  
Vol 27 ◽  
Author(s):  
C.A. Hewett ◽  
I. Suni ◽  
S.S. Lau ◽  
L.S. Hung ◽  
D.M. Scott
Keyword(s):  
Melting Point ◽  
Ion Implantation ◽  
Phase Transformations ◽  
Amorphous Phase ◽  
Phase Formation ◽  
Amorphous Phases ◽  
Post Annealing ◽  
Amorphous Phase Formation ◽  
Ion Implanted

ABSTRACTIon implantation induced phase transformations and recrystallization during post-annealing in CoSi2, CrSi2, and Pd2Si are studied. All three silicides are found to reorder at about 1/3 the melting point of the silicide. We speculate that ion-implanted silicides recrystallize by the same mechanism and that amorphous phases produced by implantation are unstable rather than metastable.

scholarly journals AMORPHOUS PHASE FORMATION OF Ni/Ti BILAYER SYSTEM BY SOLID STATE REACTION AND ION BEAM MIXING

1990 ◽  
Vol 39 (7) ◽  
pp. 101
Author(s):  
LIU WEN-HONG ◽  
ZHU DE-ZHANG ◽  
WANG ZHEN-XIA ◽  
LIU XIANG-HUAI
Keyword(s):  
Solid State ◽  
Amorphous Phase ◽  
Phase Formation ◽  
Solid State Reaction ◽  
Ion Beam ◽  
Ion Beam Mixing ◽  
Bilayer System ◽  
Amorphous Phase Formation

scholarly journals Effect of Ion Irradiation on Nanoindentation Fracture and Deformation in Silicon Carbide

JOM ◽  
2021 ◽  
Author(s):  
Alexander J. Leide ◽  
Richard I. Todd ◽  
David E. J. Armstrong
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Residual Stresses ◽  
Focused Ion Beam ◽  
Electron Backscatter Diffraction ◽  
Ion Irradiation ◽  
Ion Beam ◽  
Resolution Electron ◽  
Radiation Induced ◽  
Compressive Residual Stresses

AbstractSilicon carbide is desirable for many nuclear applications, making it necessary to understand how it deforms after irradiation. Ion implantation combined with nanoindentation is commonly used to measure radiation-induced changes to mechanical properties; hardness and modulus can be calculated from load–displacement curves, and fracture toughness can be estimated from surface crack lengths. Further insight into indentation deformation and fracture is required to understand the observed changes to mechanical properties caused by irradiation. This paper investigates indentation deformation using high-resolution electron backscatter diffraction (HR-EBSD) and Raman spectroscopy. Significant differences exist after irradiation: fracture is suppressed by swelling-induced compressive residual stresses, and the plastically deformed region extends further from the indentation. During focused ion beam cross-sectioning, indentation cracks grow, and residual stresses are modified. The results clarify the mechanisms responsible for the modification of apparent hardness and apparent indentation toughness values caused by the compressive residual stresses in ion-implanted specimens.

Amorphous phase formation in irradiated intermetallic compounds

1983 ◽  
Vol 77 (3-4) ◽  
pp. 273-293 ◽  
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
L. A. Charlot
Keyword(s):  
Intermetallic Compounds ◽  
Amorphous Phase ◽  
Phase Formation ◽  
Amorphous Phase Formation
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