Das Jayanta, Tang Mei Bo, Kim Ki Buem, Theissmann Ralf, Baier Falko, Wang Wei Hua, Eckert Jürgen
FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany.
Phys Rev Lett. 2005 May 27;94(20):205501. doi: 10.1103/PhysRevLett.94.205501. Epub 2005 May 23.
Usually, monolithic bulk metallic glasses undergo inhomogeneous plastic deformation and exhibit poor ductility (< 1%) at room temperature. We present a new class of bulk metallic glass, which exhibits high strength of up to 2265 MPa together with extensive "work hardening" and large ductility of 18%. Significant increase in the flow stress was observed during deformation. The "work-hardening" capability and ductility of this class of metallic glass is attributed to a unique structure correlated with atomic-scale inhomogeneity, leading to an inherent capability of extensive shear band formation, interactions, and multiplication of shear bands.
通常情况下，整体块状金属玻璃会发生不均匀塑性变形，在室温下表现出较差的延展性（<1%）。我们提出了一种新型块状金属玻璃，它具有高达2265兆帕的高强度，同时具有广泛的“加工硬化”和18%的大延展性。在变形过程中观察到流动应力显著增加。这类金属玻璃的“加工硬化”能力和延展性归因于与原子尺度不均匀性相关的独特结构，从而导致形成大量剪切带、剪切带相互作用以及剪切带增殖的内在能力。
