仿生竹纤维五系铝基复合结构强-韧性调控与界面显微组织研究(特邀)  

Strength-Toughness Modulation and Interfacial Microstructure of Bionic Bamboo Fiber-like Aluminum-Based Composite Structures(Invited)

作　　者：杨光 马一鑫 赵朔 钦兰云 王向明[3] Yang Guang;Ma Yixin;Zhao Shuo;Qin Lanyun;Wang Xiangming(College of Mechanical and Electrical Engineering,Shenyang Aerospace University,Liaoning 110136,Shenyang,China;Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Liaoning 110136,Shenyang,China;Shenyang Aircraft Design Institute,Aviation Industry Group Corporation,Liaoning 110035,Shenyang,China)

机构地区：[1]沈阳航空航天大学机电工程学院,辽宁沈阳110136 [2]沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,辽宁沈阳110136 [3]航空工业沈阳飞机设计研究所,辽宁沈阳110035

出　　处：《中国激光》2024年第10期187-195,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2022YFB4600901);国家自然科学基金(52375359);辽宁省国际科技合作计划(2023JH2/10700024)。

摘　　要：为进一步提高铝基复合材料的强度与韧性,避免强韧性倒置关系,通过在铝基体中加入不同体积分数与尺寸的钛合金骨架结构,制备出强韧性可调控的仿竹纤维Al-Ti复合结构。研究发现:钛合金强化骨架与铝合金基体界面间发生了扩散反应,形成了致密的冶金结合,界面内析出相为钛铝金属间化合物。与传统铝基复材相比,复合结构铝基复合材料抗压强度高达380~1085 MPa,形成一体化微/宏观“高强-高韧”纤维状复合结构。对微观变形机制进行研究:高强度化合物的析出有效阻止了异质界面内裂纹萌生、扩展。同时高分辨下观察发现,界面内析出的Ti3Al相变形后在晶粒内部形成了有效的变形孪晶,提升了界面内高、低模量析出相间协调变形能力,是复合结构增强-增韧的主要机制。Objective Aluminum matrix composites(AMCs)are widely used in the aerospace industry,transportation,electronics,and other fields because of their high specific strength,low cost,good corrosion resistance,and easy recyclability,which puts higher demands on their comprehensive performance to meet the damage tolerance design criteria.However,AMCs prepared by traditional methods are costly and complex,and the formed materials are prone to the phenomenon of mutual exclusion of strength and fracture toughness.To further improve the strength and toughness of AMCs and overcome the inverse relationship between them,in addition to the selection of the reinforcement material for the matrix,the preparation method and design of the spatial structure also play a crucial role in the construction of highstrength and hightoughness AMCs.The additive manufacturing method differs from the traditional preparation method in that it stacks layers of material onto a substrate and can obtain a free form by precisely regulating the phase evolution as well as the distribution of components and structures.Thus,as it can customize the structure and synthesize a variety of materials,this process is more suitable for developing heterogeneous structures.At the same time,bionic structures provide a new way of thinking for realizing highperformance materials by mimicking the regulation of existing microstructures in nature.Methods By adding titanium alloy skeleton structures with different volume fractions and sizes to the aluminum matrix,strength-and toughnessadjustable bamboo fiberlike AlTi composite structures were prepared.The micro/macro interfacial organization of the composite structure was observed,the chemical composition and elemental distribution of each phase were analyzed,the coordinated deformation ability of the composite structure under compressive stress was studied,and the deformation and interfacial toughening mechanisms of the composite structure were elucidated.Results and Discussions It is found that a diffusion reaction occu

关 键 词：激光技术 增材制造 仿生结构 Al-Ti复合结构材料 微/宏观强韧性调控 

分 类 号：TN249[电子电信—物理电子学]