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非晶合金具有远超于传统金属材料的高强度、高硬度，但由于非晶合金的塑性变形高度局限于剪切带内，致使它的室温塑性变形能力极差。晶体-非晶、非晶-非晶双相结构是解决非晶合金塑性差、脆性高的有效策略之一。相变可实现从单一的晶体、非晶结构向晶体-非晶、非晶-非晶双相结构的转变，通过相变过程中的能量耗散与结构重组，实现超高强度与大的均匀塑性变形。衍生的双相合金可以继承非晶合金的独特性能，如：优异的力学性能、软硬磁性能、储氢性能及催化性能等。基于此，本文综述了晶体-非晶、非晶-非晶相变行为的研究进展，着重讨论了如何通过机械载荷、热处理等手段诱导相变的发生，同时强调了混合焓设计、元素配分对相变行为的重要影响。最后，本文对晶体-非晶与非晶-非晶双相材料的力学和功能特性进行了简单概述。Unlike conventional crystalline metals, amorphous alloys possess a distinctive atomic arrangement of short-range order and long-range disorder, so they lack dislocations, grain boundaries and other conventional crystalline defects and therefore exhibit very high strength and hardness. However, their plastic deformation is highly localized into nanoscale shear bands, which readily leads to catastrophic fracture and results in very poor room-temperature ductility. Forming crystalline-amorphous or amorphous- amorphous dual-phase structure is an effective strategy to overcome the brittleness and limited plasticity of amorphous alloys. On the one hand, such heterogeneous architectures promote the formation of multiple shear bands, thereby dissipating energy and redistributing stress; on the other hand, when the amorphous phase size is reduced below roughly 100 nm, the glassy phase can deform by homogeneous flow, and interactions between nanoscale amorphous regions and dislocation activity in the crystalline phase favor more uniform macroscopic plasticity. Mechanical loading, heat treatment and other processing routes can drive the transformation from crystalline single-phase or amorphous states to crystalline-amorphous or amorphous-amorphous dual-phase structures, enabling a simultaneous achievement of ultrahigh strength and substantial uniform plastic deformation. The resulting dual-phase alloys can retain the unique properties of amorphous alloys. Accordingly, this review summarizes recent advances in crystalline-amorphous and amorphous-amorphous phase- transformation behavior:
(1) Mechanical loading (friction, TRIP effects) can induce phase transformations. During frictional wear, materials experience large shear strains and stress concentrations; together with chemical reaction, these conditions can produce crystalline-amorphous dual-phase structures at the surface. Under externally applied loads, phase transformations and microstructural reconfiguration occur; crystalline-amorphous and amorphous-amorphous TRIP effects become the primary mechanisms for energy dissipation, thereby delaying local stress concentration and improving ductility and fracture resistance.
(2) Thermal annealing above the glass transition temperature commonly induces crystallization of amorphous alloys, leading to in-situ precipitation of nanocrystals within the amorphous matrix. By controlling annealing temperature and time, the size and volume fraction of the precipitates can be tuned, and more refined heat-treatment paths can even trigger amorphous-amorphous transformation.
(3) Mixing enthalpy design and elemental partitioning play important roles in crystalline-amorphous and amorphous-amorphous phase behaviors. Elements with large negative mixing enthalpies tend to attract and enrich one another, whereas those with positive mixing enthalpies tend to repel; mechanical loading, thermal treatment and other external driving forces further promote atomic diffusion and elemental redistribution, which mediate the formation of crystalline-amorphous and amorphous- amorphous dual-phase structures.
(4) These unique structures endow crystalline-amorphous and amorphous-amorphous dual-phase alloys with excellent strength-ductility combinations as well as advantageous magnetic, hydrogen-storage and catalytic properties. Future research should concentrate on three directions: (Ⅰ) establishing a thermodynamic design framework centered on mixing enthalpy to clarify how compositional changes affect phase stability; (Ⅱ) developing large-scale, and mass-producible routes for dual-phase materials; and (Ⅲ) designing application-oriented dual-phase alloy systems that are low-cost, simple to fabricate, and have long service lives, thereby accelerating their industrial deployment in energy, precision machinery, electronics and communications, aerospace, and biomedical fields.-
Keywords:
- Crystalline-amorphous /
- amorphous-amorphous /
- elemental partitioning /
- phase transformation
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