Compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni bulk metallic glasses

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2010-06, Vol.17 (3), p.318-322
• Main Authors: An, Jihye, Yim, Hyunjune, Haein, Choi-Yim
• Format: Article
• Language: English
• Subjects: Alloys; Amorphous materials; Bulk modulus; Calorimetry; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Copper; Copper base alloys; Corrosion and Coatings; Crystallization; Elastic properties; Glass; Glass formation; Glass transition temperature; Heating rate; Liquidus; Materials Science; Metallic glasses; Metallic Materials; Modulus of elasticity; Natural Materials; Nickel base alloys; Poisson's ratio; Quaternary alloys; Rods; Shear modulus; Surfaces and Interfaces; Thin Films; Titanium; Transition temperatures; Tribology; Ultrasonic methods; X ray spectra; 大块金属玻璃; 弹性性能; 成分依赖性; 热性能; 玻璃化转变温度; 玻璃形成能力; 约化玻璃转变温度; 锆镍合金
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-010-0311-y

Starting from the quaternary Cu47Ti34Zr11Ni8 alloy, the compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni alloys was systematically investigated. Quaternary Cu-Ti-Zr-Ni alloys can be cast directly from the melt into copper molds to form fully amorphous strips or rods with the thickness of 3-6 mm. The evidence of the amorphous nature of the cast rods was provided by X-ray spectra. The measured glass transition temperature （Tg） and crystallization temperature （Tx） were obtained for the alloys using differential scanning calorimetry （DSC） at the heating rate of 20 K/s. In the results, the differences between the glass temperature and the crystallization temperature （△Tx=Tx-Tg） are measured with values ranging up to 33-55 K. The reduced glass transition temperature （Trg）, which is the ratio of the glass temperature to the liquidus temperature （T3, is often used as an indication of the glass-forming ability of metallic alloys. For the present Cu-Ti-Zr-Ni alloys, this ratio is typically in the range of 0.5838-0.5959, characteristic of metallic alloys with good glass-forming ability. The elastic constants for several selected alloys were measured using ultrasonic methods. The values of the elastic shear modulus, bulk modulus, and Poisson＇s ratio were also given.