期刊
MATERIALS & DESIGN
卷 220, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2022.110896
关键词
Bulk metallic glass; Microalloying; Glass-forming ability; Plasticity
资金
- National Key R&D Program of China [2018YFB1105800]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- National Natural Science Foundation of China [11772287, 11802260]
- National Key Research and Develop-ment Program [2021YFB3702304-4]
The influences of Ag and Co additions on the thermal stability and glass-forming abilities of the alloys were systematically investigated. The mechanical performances were evaluated, and the plasticization mechanisms were discussed based on observations. The (Cu43Zr47Al7Ag3)(99.5)Co-0.5 bulk metallic glass exhibited excellent thermal stability and improved plasticity after compression tests.
The influences of Ag and Co additions on the thermal stability and glass-forming abilities of twenty (Cu46-xZr47Al7Agx)(100)Co--y(y) (x = 0, 1, 2, 3, 4 and y = 0, 0.5, 1, 1.5) alloys were systematically investigated by X-ray diffraction and differential scanning calorimeter techniques. The mechanical performances (i.e., hardness, strength, and plasticity) of the alloys were evaluated, and the plasticization mechanisms of four representative (Cu46-xZr47Al7Agx)(100)Co--y(y) specimens were discussed based on the observations of scanning electron microscopy and high-resolution transmission electron microscopy. It is found that (Cu43Zr47Al7Ag3)(99.5)Co-0.5 bulk metallic glass exhibits excellent thermal stability and improved plasticity after compression tests. The improvement can be attributed to the large amount and density of shear bands, the coexistence of a large area of smooth regions, the vein-like pattern, and the river-like pattern on the fractures. More importantly, the new-formed B2-CuZr phases and nanocrystallines during compressive tests also contribute to the improved plastic deformation ability by exalting the number and density of shear bands. (C) 2022 Published by Elsevier Ltd.
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