TY - JOUR
T1 - The effect of boron on the thermal properties of the zirconium-based bulk amorphous alloys
AU - Jang, J. S.C.
AU - Hung, T. H.
AU - Chang, L. J.
N1 - Funding Information:
This research was sponsored by the National Science Council, the Republic of China, under the project number of NSC89-2216-E-214-009. The author is also very grateful for the assistance of TEM by Ms. Liang-Chu Wang.
PY - 2004/7/15
Y1 - 2004/7/15
N2 - Ribbons of amorphous Zr65-xAl7.5Cu17.5 Ni10Bx alloys with 0.1 mm thickness were prepared by melt-spinning. The thermal properties and microstructural development during the annealing of amorphous alloys have been investigated by the combination of differential thermal analysis (DTA), differential scanning calorimetry (DSC), high-temperature optical microscope, X-ray diffractometry (XRD), and transmission electron microscopy (TEM). The glass transition temperature for the Zr65-xAl7.5Cu17.5Ni10 Bx alloys were measured around 645 K. The crystallization temperature increased with increasing boron content to 4 at.% and obtained a relative large temperature interval Δ Tx of around 88 K. The calculated Trg for Zr65 Al7.5Cu17.5Ni10 alloy, Zr63 Al7.5Cu17.5Ni10B2 alloy, and Zr61Al7.5Cu17.5Ni10B4 alloy exhibit the same value of 0.57. The activation energy of crystallization for the Zr61Al7.5Cu17.5 Ni10B2 alloy was about 360 or 380 kJ/mol, as determined by the Kissinger or Avrami plot, respectively. These values are about 20% higher than the activation energy of crystallization for the base alloy (314 kJ/mol as determined by the Kissinger plot). The average value of the Avrami exponent n were calculated to be 1.96±0.25 for Zr65Al7.5Cu17.5 Ni10 alloy, 1.75±0.15 for Zr63Al7.5 Cu17.5Ni10B2 alloy, and 1.9±90.45 for Zr61Al7.5Cu17.5Ni10 B4 alloy. This indicates that these three alloys exhibit similar crystallization process, a diffusion controlled growth process with a decreasing nucleation rate.
AB - Ribbons of amorphous Zr65-xAl7.5Cu17.5 Ni10Bx alloys with 0.1 mm thickness were prepared by melt-spinning. The thermal properties and microstructural development during the annealing of amorphous alloys have been investigated by the combination of differential thermal analysis (DTA), differential scanning calorimetry (DSC), high-temperature optical microscope, X-ray diffractometry (XRD), and transmission electron microscopy (TEM). The glass transition temperature for the Zr65-xAl7.5Cu17.5Ni10 Bx alloys were measured around 645 K. The crystallization temperature increased with increasing boron content to 4 at.% and obtained a relative large temperature interval Δ Tx of around 88 K. The calculated Trg for Zr65 Al7.5Cu17.5Ni10 alloy, Zr63 Al7.5Cu17.5Ni10B2 alloy, and Zr61Al7.5Cu17.5Ni10B4 alloy exhibit the same value of 0.57. The activation energy of crystallization for the Zr61Al7.5Cu17.5 Ni10B2 alloy was about 360 or 380 kJ/mol, as determined by the Kissinger or Avrami plot, respectively. These values are about 20% higher than the activation energy of crystallization for the base alloy (314 kJ/mol as determined by the Kissinger plot). The average value of the Avrami exponent n were calculated to be 1.96±0.25 for Zr65Al7.5Cu17.5 Ni10 alloy, 1.75±0.15 for Zr63Al7.5 Cu17.5Ni10B2 alloy, and 1.9±90.45 for Zr61Al7.5Cu17.5Ni10 B4 alloy. This indicates that these three alloys exhibit similar crystallization process, a diffusion controlled growth process with a decreasing nucleation rate.
KW - Bulk amorphous
KW - Crystallization kinetics
KW - Glass transition temperature
KW - Thermal properties
KW - Zirconium-based alloy
UR - http://www.scopus.com/inward/record.url?scp=3142716734&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2003.10.069
DO - 10.1016/j.msea.2003.10.069
M3 - 期刊論文
AN - SCOPUS:3142716734
SN - 0921-5093
VL - 375-377
SP - 307
EP - 311
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
IS - 1-2 SPEC. ISS.
ER -