In this study, to meet the development and application requirements for high-strength and hightoughness energetic structural materials, a representative volume element of a TA15 matrix embedded with a TaZrNb sphere wa...In this study, to meet the development and application requirements for high-strength and hightoughness energetic structural materials, a representative volume element of a TA15 matrix embedded with a TaZrNb sphere was designed and fabricated via diffusion bonding. The mechanisms of the microstructural evolution of the TaZrNb/TA15 interface were investigated via SEM, EBSD, EDS, and XRD.Interface mechanical property tests and in-situ tensile tests were conducted on the sphere-containing structure, and an equivalent tensile-strength model was established for the structure. The results revealed that the TA15 titanium alloy and joint had high density and no pores or cracks. The thickness of the planar joint was approximately 50-60 μm. The average tensile and shear strengths were 767 MPa and 608 MPa, respectively. The thickness of the spherical joint was approximately 60 μm. The Zr and Nb elements in the joint diffused uniformly and formed strong bonds with Ti without forming intermetallic compounds. The interface exhibited submicron grain refinement and a concave-convex interlocking structure. The tensile fracture surface primarily exhibited intergranular fracture combined with some transgranular fracture, which constituted a quasi-brittle fracture mode. The shear fracture surface exhibited brittle fracture with regular arrangements of furrows. Internal fracture occurred along the spherical interface, as revealed by advanced in-situ X-ray microcomputed tomography. The experimental results agreed well with the theoretical predictions, indicating that the high-strength interface contributes to the overall strength and toughness of the sphere-containing structure.展开更多
世界卫生组织(World Health Organization, WHO)强调通过健康促进、疾病预防和早诊早治以提升健康水平。由于疾病种类繁多、观点错杂,病机往往呈现为“多元化”的势态,尤其重大慢病、疑难重症、复合共病更是与复合体质状态密切关联,故...世界卫生组织(World Health Organization, WHO)强调通过健康促进、疾病预防和早诊早治以提升健康水平。由于疾病种类繁多、观点错杂,病机往往呈现为“多元化”的势态,尤其重大慢病、疑难重症、复合共病更是与复合体质状态密切关联,故而从“体病相关”切入探讨是突破疾病预测、预防以及治疗瓶颈的关键。基于多年的研究提出“五行十态体质”创新观点;遵循“天人相应”规律,将传统六十甲子周期理论运用于体质状态研究,综合考虑五运六气交互承制、天干地支本属系统、正化对化、天地二甲子、运气的平气状态等关键因素对人体五脏六腑功能的影响,运用传统“医算法”,依据“生克制化”“胜复郁发”“淫胜郁复”之气机升降特点,详细分析了基础体质与后天体质状态的关联;重视始生之时、疾病始发时、传变时、欲解时以及就诊时等不同节点的运气格局对人体的影响,以揭示体质特异性与相应系统疾病的易感性以及脏腑复合病机主、次标本的关系,预判健康状态与疾病不同阶段的病机、病势演变,为临床疾病的预测、预防、个体化干预以及群体化防治提供指导思路。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.12372351).
文摘In this study, to meet the development and application requirements for high-strength and hightoughness energetic structural materials, a representative volume element of a TA15 matrix embedded with a TaZrNb sphere was designed and fabricated via diffusion bonding. The mechanisms of the microstructural evolution of the TaZrNb/TA15 interface were investigated via SEM, EBSD, EDS, and XRD.Interface mechanical property tests and in-situ tensile tests were conducted on the sphere-containing structure, and an equivalent tensile-strength model was established for the structure. The results revealed that the TA15 titanium alloy and joint had high density and no pores or cracks. The thickness of the planar joint was approximately 50-60 μm. The average tensile and shear strengths were 767 MPa and 608 MPa, respectively. The thickness of the spherical joint was approximately 60 μm. The Zr and Nb elements in the joint diffused uniformly and formed strong bonds with Ti without forming intermetallic compounds. The interface exhibited submicron grain refinement and a concave-convex interlocking structure. The tensile fracture surface primarily exhibited intergranular fracture combined with some transgranular fracture, which constituted a quasi-brittle fracture mode. The shear fracture surface exhibited brittle fracture with regular arrangements of furrows. Internal fracture occurred along the spherical interface, as revealed by advanced in-situ X-ray microcomputed tomography. The experimental results agreed well with the theoretical predictions, indicating that the high-strength interface contributes to the overall strength and toughness of the sphere-containing structure.
文摘世界卫生组织(World Health Organization, WHO)强调通过健康促进、疾病预防和早诊早治以提升健康水平。由于疾病种类繁多、观点错杂,病机往往呈现为“多元化”的势态,尤其重大慢病、疑难重症、复合共病更是与复合体质状态密切关联,故而从“体病相关”切入探讨是突破疾病预测、预防以及治疗瓶颈的关键。基于多年的研究提出“五行十态体质”创新观点;遵循“天人相应”规律,将传统六十甲子周期理论运用于体质状态研究,综合考虑五运六气交互承制、天干地支本属系统、正化对化、天地二甲子、运气的平气状态等关键因素对人体五脏六腑功能的影响,运用传统“医算法”,依据“生克制化”“胜复郁发”“淫胜郁复”之气机升降特点,详细分析了基础体质与后天体质状态的关联;重视始生之时、疾病始发时、传变时、欲解时以及就诊时等不同节点的运气格局对人体的影响,以揭示体质特异性与相应系统疾病的易感性以及脏腑复合病机主、次标本的关系,预判健康状态与疾病不同阶段的病机、病势演变,为临床疾病的预测、预防、个体化干预以及群体化防治提供指导思路。
