Ternary Co-Mo-B bulk metallic glasses with ultrahigh strength and good ductility
Limin Lai Rangan He Kailu Ding Tianhao Liu Ruoyu Liu Yanxia Chen Shengfeng Guo
Scholl of Materials and Energy, Southwest University, Chongqing 400715, China
Abstract
In this work, novel ternary Co100-x-yMoxBy (at.%, x = 18–28, y = 11–17) bulk metallic glasses (BMGs) with ultrahigh strength and good ductility were developed by copper mold casting technology. The best glass former of the marginal BMG chemical composition was Co64Mo22B14 with a maximum critical size up to 2 mm in diameter. It revealed that the compressive strength and plastic strain of Co-Mo-B ternary BMGs were 4630–5400 MPa and 0.8–5.1%, respectively. The intrinsic strengthening mechanism was the network-like atomic configurations that could act as the origins for high resistance against plastic yielding. The good plasticity was mainly attributed to the glassy alloys containing a large amount of randomly distributed free volume with a high Poisson's ratio.
https://www.sciencedirect.com/science/article/pii/S0022309319305289?dgcid=author
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