Recently, under the guidance of Liu Jinchuan, a foreign academician of the Chinese Academy of Engineering, postdoctoral fellows Yang Tao and Zhao Yilu of the City University of Hong Kong, based on the design idea of ​​"grain boundary nanodisorder", developed a new type of intermetallic compound with high strength, high plasticity and high thermal stability. Materials and related research are published in "Science". This new type of alloy design strategy is expected to create more excellent comprehensive performance and be widely used in aerospace, automotive, nuclear energy, chemical engineering and other fields.
As humans travel to the moon to search for fire, the demand for high-strength, high-toughness, and high-temperature resistant materials is becoming more and more urgent. Most of the intermetallic compounds developed in the past few decades are based on binary alloys, which often exhibit very prominent contradictions between strength and plasticity at room temperature. Designing a new type of intermetallic compound alloy with high strength, high plasticity and high thermal stability has become a severe challenge facing the current alloy design.
"By introducing a unique'grain boundary nano-disordered layer' into the multi-component intermetallic compound system, we formed a composite structure with order in the grain and disorder in the grain boundary, and obtained high strength, high toughness and high thermal stability. Comprehensive performance." Yang Tao pointed out.
The researchers jumped out of the traditional high-temperature intermetallic compound alloy design strategy and focused on the nano-level interface disorder, which provides a new direction for adjusting the microstructure. They coordinate the structure and chemical characteristics of bulk ordered alloys to achieve excellent mechanical properties and special thermal stability. During arc smelting and thermomechanical processing, they added a small amount of boron to the alloy and developed a "grain boundary nano-disordered layer" composed of disordered interface nano-layers and a composite structure in which ordered superlattice grains were wrapped. This greatly improves the ductility of the material and helps greatly reduce grain coarsening under high temperature conditions.
This unique "grain boundary nano-disordered layer" structure and concept is expected to be applied to more alloy systems, especially multi-component intermetallic compound alloy systems, which are new types of high-strength, high-toughness, and high-temperature resistant structural materials and alloys. Development provides new design ideas.
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