Enhanced tensile strength and ductility of bulk metallic glasses Zr52.5Cu17.9Al10Ni14.6Ti5 via high-pressure torsion

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:803

Article

Ren, Zhi Qiang¹  Churakova, A. A.^2,3  Wang, Xiang¹  Goel, Sunkulp¹  Liu, Si Nan¹  You, Ze Sheng¹  Liu, Ying¹  Lan, Si¹  Gunderov, D. V.^2,3  Wang, Jing Tao¹  Valiev, R. Z.^3,4 

[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210014, Peoples R China

[2] RAS, Inst Mol & Crystal Phys, Ufa Fed Res Ctr, Ufa 450075, Russia

[3] Ufa State Aviat Tech Univ, 12 K Marx Str, Ufa 450008, Russia

[4] St Petersburg State Univ, 28 Univ Skiy Pr, St Petersburg 198504, Russia

关键词: Amorphous-crystalline composites;    Tensile ductility;    Strength;    Free volume;    Inter-crystallite spacing;    Ductilization window;   

DOI  :  10.1016/j.msea.2020.140485

来源: Elsevier

【 摘 要 】

Zr52.5Cu17.9Al10Ni14.6Ti5 (Vit105) Bulk metallic glass is processed by High-Pressure Torsion up to 30 rotations at room temperature, showing simultaneous enhancement of both strength (2023 MPa) and ductility (0.45%). Nano-crystal precipitates with an average size of 45 nm inside the amorphous matrix are observed after 30 turns HPT. Free volume increases from similar to 0.9030 angstrom(3) (as cast) to similar to 0.9275 angstrom(3) after 30 turn HPT alloy with 2.83% (by volume) of nanocrystal precipitates. Strengthening due to precipitation after 30 turns HPT comply with the phase mixture model. The synergetic effect of free volume and nanocrystal precipitation on the ductility of amorphouscrystallite composite is quantitatively approached through modelling. By implementing the model, a ductilization window between bottom limit and top limit of the inter-crystallite spacing w.r.t the free volume is established, elucidating the necessary conditions required to obtain plasticity in amorphous-crystalline composites.

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