Influence of Heat Treatment Process on Tensile Fracture Behavior of Cu-Based Metallic Glass

Abstract:

The Cu₅₀Zr₄₂Al₈ dumbbell-shaped alloy with original scale distance of 25 mm and diameters of 4.5 mm was prepared by the suspend melting-copper mould suction casting. The structure tensile performance testing and the fracture morphology observation of Cu₅₀Z_r42Al₈ BMG as-quenched and 400k/1h isothermal annealing were investigated, respectively. The deformation and fracture behavior of samples had been studied. The results showed that the structure of all samples were composed of amorphous phase and possess good glass formation abilitysample as-quenched is always in the elastic deformation stage during elongation and the tensile strength is 629MPa; however ,for specimen after 400k/1h isothermal annealing ,the yield phenomenon occurs before breaking and the maximum tensile strength is 755Mpa, and the same time, the maximum failure extensibility increases from 0.56% for sample as-quenched to 0.80% for 400k/1h isothermal annealing. The fracture pattern of test sample at annealing assumes venation pattern, which is similar to fractography of Cu₅₀Zr₄₂Al₈ BMG as-quenched, in addition, which appeared apparent viscous flow behavior and melting characteristics.

• Periodical: Advanced Materials Research (Volume 742)
• Pages: 170-174
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.742.170
• Online since: August 2013
• Authors: Ling Zhang, De Chun Luo, Xiang Bin Yi
• Keywords: Dumbbell-Shaped Cu-Based Bulk Metallic Glass, Fracture Behavior, Glass Forming Ability, Tensile Performance

References

[1] Pingjun Tao, Yuanzheng Yang. Properties and application of the bulk metallic glass [J]. Light Alloy Fabrication Technology，2006，34 (1):45-47.

[2] Turnbull D，Cohen M H. Concerning Reconstructive Transformation and Formation of Glass. Chem. Phys, 1958, 29:1049-1054

DOI: 10.1063/1.1744654

[3] Yongzhang Zhang, Zhiwei Xie, Yuanzheng Yang. Research progress of Cu-based Bulk Amorphous Alloys [J]. Guangdong Journal of nonferrous metals,2006,16(1):41-45.

[4] Yonghua Wang, Guangrong Zhai. Analysis of the economic performance of amorphous alloy dry-type transformer. Power equipment.2004. No.11

[5] Spaepen F.[J]. Acta Metallurgica,1977,25:407.

[6] Jeamy H J , Chen H S , Wang T T. Plastic flow and fracture of metallic glass [J ] . Metallurgical Transactions , 1972 , 3 : 699.