TY - JOUR
T1 - Solid plasticity and supercooled-liquid thermoplasticity of Zr-Cu-enriched hypoeutectic Zr-Cu-Ni-Al cast glassy alloys
AU - Yokoyama, Yoshihiko
AU - Yamada, Masahiro
AU - Mori, Tsuyoshi
AU - Tokunaga, Hitto
AU - Sato, Takeshi
AU - Shima, Toshiyuki
AU - Nishijima, Masahiko
AU - Fujita, Kazutaka
AU - Yamasaki, Tohru
N1 - Funding Information:
The authors are sincerely grateful to Sae Takashima, Hiroyuki Ogino, and the graduate students of the University of Hyogo for their experimental support. This research was funded in part by the New Energy and Industrial Technology Development Organization (NEDO) in Japan, JSPS KAKENHI Grant-in-Aid for Scientific Research (C) Project no. 23560857 , research project “Metallic Glass Inorganic Materials Joining Technology Development”; and Grant-in-aid for Research and Development Project on Advanced Metallic Glasses of the Institute for Materials Research, Tohoku University.
PY - 2014/6/12
Y1 - 2014/6/12
N2 - The plasticity of Zr-Cu enriched hypoeutectic Zr-Cu-Ni-Al cast glassy alloys (CGAs) was investigated to determine their tensile elongation as a solid at room temperature, and their precise thermoplastic moldability in a supercooled liquid state. The viscosity of the supercooled liquids was measured by using a penetration viscometer at a high-speed heating rate of 400K/min. The results obtained show that with an increase in the Zr content, the glass transition temperature (Tg) tends to decrease, whereas the crystallization temperature (Tx) tends to increase. We observed tensile elongation with plural sliding shear bands in the Zr-Cu enriched Zr65Cu20Ni5Al10 CGAs at room temperature. Furthermore, the hypoeutectic Zr65Cu18Ni7Al10 CGA exhibits the widest δTx (=Tx-Tg) of about 170K, with a low viscosity in the order of 105Pas being observed in the supercooled liquid under a heating rate of 400K/min. The potential for printing micro-patterns on the surface of a glassy Zr65Cu18Ni7Al10 alloy is demonstrated by means of tough nanocrystalline Ni-W electro-plating molds.
AB - The plasticity of Zr-Cu enriched hypoeutectic Zr-Cu-Ni-Al cast glassy alloys (CGAs) was investigated to determine their tensile elongation as a solid at room temperature, and their precise thermoplastic moldability in a supercooled liquid state. The viscosity of the supercooled liquids was measured by using a penetration viscometer at a high-speed heating rate of 400K/min. The results obtained show that with an increase in the Zr content, the glass transition temperature (Tg) tends to decrease, whereas the crystallization temperature (Tx) tends to increase. We observed tensile elongation with plural sliding shear bands in the Zr-Cu enriched Zr65Cu20Ni5Al10 CGAs at room temperature. Furthermore, the hypoeutectic Zr65Cu18Ni7Al10 CGA exhibits the widest δTx (=Tx-Tg) of about 170K, with a low viscosity in the order of 105Pas being observed in the supercooled liquid under a heating rate of 400K/min. The potential for printing micro-patterns on the surface of a glassy Zr65Cu18Ni7Al10 alloy is demonstrated by means of tough nanocrystalline Ni-W electro-plating molds.
KW - Hypoeutectic Zr-Cu-Ni-Al cast glassy alloy
KW - Supercooled liquid
KW - Tensile testing
KW - Thermoplastic microstructure forming
KW - Viscosity
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U2 - 10.1016/j.msea.2014.03.041
DO - 10.1016/j.msea.2014.03.041
M3 - Article
AN - SCOPUS:84898002859
VL - 606
SP - 74
EP - 80
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -