Abstract
Amorphous Ti{sub x}Al{sub 100-x} alloy powders with wide amorphization range (33{<=}x{<=}75) have been synthesized by rod-milling technique using a mechanical alloying (MA) process. The rod-milled alloy powders have been investigated by means of X-ray diffraction, differential scanning calorimetry, optical microscopy, scanning electron microscopy and transmission electron microscopy. The results have shown that during the first few kiloseconds (11-360 ks) of the mechanical deformation via the rod-milling technique, the layered composite particles of Ti and Al are intermixed and form an amorphous phase when heated at about 700 K by so-called thermally assisted solid state amorphization (TASSA). The heat formation of an amorphous (enthalpy change of amorphization) Ti{sub x}Al{sub 100-x} alloy via the TASSA process, {Delta}H{sup TASSA}{sub a}, has been measured directly as a function of the MA time. The crystallization characteristics indexed by the crystallization temperature T{sup TASSA}{sub x} and the enthalpy change of crystallization, {Delta}H{sup TASSA}{sub x}, of the amorphous phase formed via the TASSA process are also investigated as a function of the MA time. Comparable with the TASSA process, a homogeneous amorphous of Ti{sub x}Al{sub 100-x} alloy has been formed directly without heating the composite particles after a longer MA time (1400 ks). The amorphization process in
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El-Eskandarany, M S
[1]
- Al-Azhar Univ., Cairo (Egypt). Mining and Petroleum Eng. Dept.
Citation Formats
El-Eskandarany, M S.
Amorphization process by rod-milling Ti{sub x}Al{sub 100-x} and the effect of annealing.
Switzerland: N. p.,
1996.
Web.
doi:10.1016/0925-8388(95)01947-2.
El-Eskandarany, M S.
Amorphization process by rod-milling Ti{sub x}Al{sub 100-x} and the effect of annealing.
Switzerland.
https://doi.org/10.1016/0925-8388(95)01947-2
El-Eskandarany, M S.
1996.
"Amorphization process by rod-milling Ti{sub x}Al{sub 100-x} and the effect of annealing."
Switzerland.
https://doi.org/10.1016/0925-8388(95)01947-2.
@misc{etde_206176,
title = {Amorphization process by rod-milling Ti{sub x}Al{sub 100-x} and the effect of annealing}
author = {El-Eskandarany, M S}
abstractNote = {Amorphous Ti{sub x}Al{sub 100-x} alloy powders with wide amorphization range (33{<=}x{<=}75) have been synthesized by rod-milling technique using a mechanical alloying (MA) process. The rod-milled alloy powders have been investigated by means of X-ray diffraction, differential scanning calorimetry, optical microscopy, scanning electron microscopy and transmission electron microscopy. The results have shown that during the first few kiloseconds (11-360 ks) of the mechanical deformation via the rod-milling technique, the layered composite particles of Ti and Al are intermixed and form an amorphous phase when heated at about 700 K by so-called thermally assisted solid state amorphization (TASSA). The heat formation of an amorphous (enthalpy change of amorphization) Ti{sub x}Al{sub 100-x} alloy via the TASSA process, {Delta}H{sup TASSA}{sub a}, has been measured directly as a function of the MA time. The crystallization characteristics indexed by the crystallization temperature T{sup TASSA}{sub x} and the enthalpy change of crystallization, {Delta}H{sup TASSA}{sub x}, of the amorphous phase formed via the TASSA process are also investigated as a function of the MA time. Comparable with the TASSA process, a homogeneous amorphous of Ti{sub x}Al{sub 100-x} alloy has been formed directly without heating the composite particles after a longer MA time (1400 ks). The amorphization process in this case is attributed to a mechanical driven solid state amorphization (MDSSA). At the end of the MA processing time (360-1440 ks), the maximum heat formation of an amorphous Ti{sub x}Al{sub 100-x} alloy via the MDSSA process {Delta}H{sup MDSSA}{sub a} has been estimated. Moreover, the thermal stability characterized by the crystallization temperature, T{sup MDSSA}{sub x}, and the enthalpy change of crystallization, {Delta}H{sup MDSSA}{sub x}, are also presented. The role of amorphization of Ti{sub x}Al{sub 100-x} alloy powders for each process has been discussed. (orig.)}
doi = {10.1016/0925-8388(95)01947-2}
journal = []
issue = {1}
volume = {234}
journal type = {AC}
place = {Switzerland}
year = {1996}
month = {Feb}
}
title = {Amorphization process by rod-milling Ti{sub x}Al{sub 100-x} and the effect of annealing}
author = {El-Eskandarany, M S}
abstractNote = {Amorphous Ti{sub x}Al{sub 100-x} alloy powders with wide amorphization range (33{<=}x{<=}75) have been synthesized by rod-milling technique using a mechanical alloying (MA) process. The rod-milled alloy powders have been investigated by means of X-ray diffraction, differential scanning calorimetry, optical microscopy, scanning electron microscopy and transmission electron microscopy. The results have shown that during the first few kiloseconds (11-360 ks) of the mechanical deformation via the rod-milling technique, the layered composite particles of Ti and Al are intermixed and form an amorphous phase when heated at about 700 K by so-called thermally assisted solid state amorphization (TASSA). The heat formation of an amorphous (enthalpy change of amorphization) Ti{sub x}Al{sub 100-x} alloy via the TASSA process, {Delta}H{sup TASSA}{sub a}, has been measured directly as a function of the MA time. The crystallization characteristics indexed by the crystallization temperature T{sup TASSA}{sub x} and the enthalpy change of crystallization, {Delta}H{sup TASSA}{sub x}, of the amorphous phase formed via the TASSA process are also investigated as a function of the MA time. Comparable with the TASSA process, a homogeneous amorphous of Ti{sub x}Al{sub 100-x} alloy has been formed directly without heating the composite particles after a longer MA time (1400 ks). The amorphization process in this case is attributed to a mechanical driven solid state amorphization (MDSSA). At the end of the MA processing time (360-1440 ks), the maximum heat formation of an amorphous Ti{sub x}Al{sub 100-x} alloy via the MDSSA process {Delta}H{sup MDSSA}{sub a} has been estimated. Moreover, the thermal stability characterized by the crystallization temperature, T{sup MDSSA}{sub x}, and the enthalpy change of crystallization, {Delta}H{sup MDSSA}{sub x}, are also presented. The role of amorphization of Ti{sub x}Al{sub 100-x} alloy powders for each process has been discussed. (orig.)}
doi = {10.1016/0925-8388(95)01947-2}
journal = []
issue = {1}
volume = {234}
journal type = {AC}
place = {Switzerland}
year = {1996}
month = {Feb}
}