Martensitic transformation in a B2-containing CuZr-based BMG composite revealed by in situ neutron diffraction

JOURNAL OF ALLOYS AND COMPOUNDS

卷:723

Article

Song, Gian^1,3  Lee, Chanho¹  Hong, Sung Hwan²  Kim, Ki Buem²  Chen, Shuying¹  Ma, Dong³  An, Ke³  Liaw, Peter K.¹ 

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Sejong Univ, Fac Nanotechnol & Adv Mat Engn, Seoul 143747, South Korea

[3] Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA

关键词: Metallic glass;    Composite;    Deformation;    Martensitic transformation;    Neutron diffraction;   

DOI  :  10.1016/j.jallcom.2017.06.270

来源: Elsevier

【 摘 要 】

CuZr-based bulk-metallic-glass (BMG) composites reinforced by a B2-type CuZr crystalline-phase (CP) have been widely studied, and exhibit that the plastic deformation of the CP induces martensitic transformation from the B2 to B190, which plays a dominant role in the deformation behavior and mechanical properties. In the present study, 2.0% Co containing CuZr-based BMG composites were investigated using in-situ neutron-diffraction technique. The in-situ neutron-diffraction results reveal the continuous load transfer from the glass matrix to B2 CP and martensitic transformation from the B2 CP to B190 during the deformation of the composite. Moreover, it was found that the martensitic transformation is initiated at the applied stress higher than 1500 MPa, and is significantly suppressed during the deformation, as compared to other 0.5% Co-containing CuZr-based BMG composites. Based on these in-situ neutron-diffraction results, the martensitic transformation is strongly affected by the amount of the addition of Co, which determines the mechanical properties of CP-reinforced BMG composites, such as ductility and hardening capability. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free