时效成形/扩散复合的异质界面层动态复合与动态析出的协同调控

heterogeneous aluminum alloys dual property components has important application perspective. Weak bonding caused by continuous precipitation phase at heterogeneous interface remains as a technical bottleneck. Base on the fundamental research of aging forming, we develop an integrated technique to fabricate composite materials and form components – age forming/diffusion bonding. We employ age forming autoclave to realize strain bonding, diffusion bonding, precise components forming and dynamic precipitation..The unique features and key innovations of this grant is as follows. We propose a nano-mechanical mechanism and evolutional path effect to overcome weak bonding: 1) vertical and dispersion precipitation of negative mismatch phase at heterogeneous interface layer; 2) With pretreatment by pre-composing/pre-aging combination, regulating dynamics bonding and precipitation at heterogeneous interface and to remove the continuous precipitation phase at heterogeneous interface. This approach is unique and has not been reported in any research domestic and abroad. . With this unique approach and innovation, 4th generation aluminum alloys -- 7055 alloy and 2524 alloy are chosen for research in process test during age forming/diffusion bonding, microscopic analysis, property test and microscopic phase field simulation. We will explore the stress orientation effect, creep induced dispersive precipitation, and evolutional path effect of pretreatment structure during age forming /diffusion bonding at heterogeneous interface layer. It will provide theoretic support in achieving ideal composite state, dynamic precipitation structure, and avoiding weak bonding by main control parameter optimization.

异种铝合金双性能构件有重要的应用前景，异质界面连续析出相导致的弱复合，是亟待解决的技术瓶颈。本团队在时效成形研究基础上，发展出复合材料制备和构件成形的组合技术——时效成形/扩散复合，采用时效成形热压罐，实现应变复合、扩散复合、精确成形、动态析出。.本基金的主要特色与创新是：提出克服弱复合的纳观力学机制和演变历程效应，利用负失配度相在异质界面层垂直、弥散析出，与预复合/预时效组合预处理配合，调控异质界面层动态复合与动态析出，消除异质界面连续析出相，立论有独到之处，未见国内外研究报道。.围绕特色与创新，选择第四代铝合金——7055合金和2524合金，时效成形/扩散复合的工艺试验、显微分析、性能测试、微观相场模拟的研究相结合，探索异质界面层动态复合与动态析出的应力取向效应、蠕变诱导弥散析出、预处理组织演变历程效应，为主控参数优化，获得理想的复合状态、动态析出组织，克服弱复合，提供理论支撑。

异种铝合金双性能构件有重要的应用前景，异质界面连续析出相导致的弱复合，是亟待解决的技术瓶颈。本团队在时效成形研究基础上，发展出复合材料制备和构件成形的组合技术——时效成形/扩散复合，采用时效成形热压罐，实现应变复合、扩散复合、精确成形、动态析出。.本基金的主要特色与创新是：提出克服弱复合的纳观力学机制和演变历程效应，利用负失配度相在异质界面层垂直、弥散析出，与预复合/预时效组合预处理配合，调控异质界面层动态复合与动态析出，消除异质界面连续析出相，立论有独到之处，未见国内外研究报道。.围绕特色与创新，选择第四代铝合金——7055合金和2524合金，时效成形/扩散复合的工艺试验、显微分析、性能测试、微观相场模拟的研究相结合，探索异质界面层动态复合与动态析出的应力取向效应、蠕变诱导弥散析出、预处理组织演变历程效应，为主控参数优化，获得理想的复合状态、动态析出组织，克服弱复合，提供理论支撑。.完成了计划研究内容，实现了技术目标。有25篇论文在《Phys.Chem.Chem.Phys》、《Rapid Research Letters》、《Modern Physics Letters B》《J Mater Sci》、《Journal of Physics》《Chin. Phys. B》、《Phys. Status Solidi B》、《Materials Science and Engineering B 》、《Mater. Res. Express》、《Solid State Communications》、《Superlattices and Microstructures》、《Physica B》、《Fatigue Fract Eng Mater Struct》等刊物上发表，超额完成计划的论文数量，有24篇被SCI收录；培养出博士生5名、硕士生8名，完成计划的培养人才数量。