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Journal of Materials Science & Technology 2021年第34期93卷 53-59页

作者： Yang Chen Yuede Cao zhixiang qi Guang Chen MIT Key Laboratory of Advanced Metallic and Itermetalic Materials Techmology Engineering Research Center of Materials Behavior and Design Ministry of EducotionNanjing University of Science and TechnologyNanjing 210094Chind

Polysynthetic twinned(PST)TiAl single crystal possesses great potentials for high-temperature applications due to its excellent combination of strength,ductility and creep ***,a critical property for high-temperature application of such material involving high-temperature fatigue properties remains ***,the high-temperature high-cycle fatigue performance of PST TiAl single crystal has been *** result shows that PST TiAl single crystal can withstand more than 107 cyclic loadings at 975℃ under a stress amplitude of 270 MPa,which is significantly higher than traditional TiAl *** observations and atomistic simulations indicate that the improvement of fatigue resistance is attributed to the plastic strain delocalization in uniform lamellar structure,and the plastic deformation is well-distributed and sufficient in each *** in theα2 lamella with difficult slippage,a large number of stacking fault structures can be ***{c+a}dislocations inα2 tend to dissociate into a Frank partial with b=1/6,forming a ribbon of I1 fault which ensures the continuity of deformation.

关键词： TiAl Single crystal Fatigue High temperature Strain delocalization

Corrosion behavior of single-and poly-crystalline dual-phase TiAl–Ti3Al alloy in NaCl solution

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 689-696页

作者： Dongpeng Wang Guang Chen Anding Wang Yuxin Wang Yanxin qiao Zhenguang Liu zhixiang qi Chain Tsuan Liu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Centre for Advanced Structural Materials Department of Mechanical and Biomechanical EngineeringCity University of Hong KongHong Kong 999077China Engineering Research Center of Materials Behavior and Design Ministry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

To clarify the correlation of single-crystalline structure with corrosion performance in high-strength TiAl alloys, electrochemical and surface characterization was performed by comparing Ti–45Al–8Nb dual-phase single crystals with their polycrystalline counterparts in NaCl solution. Polarization curves show a lower corrosion rate and a higher pitting potential of ~280 mV for the dual-phase single crystals. Electrochemical impedance spectroscopy and potentiostatic polarization plots revealed a higher impedance of the charge transfer through the compact passive film. Surface composition analysis indicated a compact film with more content of Nb, as twice as that in the film on the *** results reflect that the dual-phase Ti–45Al–8Nb single crystals possess a higher corrosion resistance in NaCl solution, compared with their polycrystalline counterpart, arising from a more homogeneous microstructure and composition distribution.

关键词： titanium alloy single crystal corrosion X-ray photoelectron spectroscopy

Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400℃

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Journal of Materials Science & Technology 2024年第5期172卷 71-82页

作者： Xiang Su Yuan Lei Yang Chen Hongjie Qu zhixiang qi Gong Zheng Xu Liu Henggao Xiang Guang Chen National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China

Heat-resistant aluminum alloys are widely used in aerospace and automotive fields for manufacturing hot components due to their advantages in lightweight design and energy ***,the high-temperature strength of existing cast aluminum alloys is always limited to about 100 MPa at 350℃due to coarsening and transformation of strengthening ***,we reveal that the yield strength and ultimate tensile strength of the T6 state Al-8.4Cu-2.3Ce-1.0Mn-0.5Ni-0.2Zr alloy at 400◦C increase by 34%and 44%after re-aging at 300℃for 100 h,and its thermal strength exhibits distinguished ad-vantage over traditional heat-resistant aluminum *** enhanced elevated-temperature strength is attributed to the reprecipitation of the Ni-bearing T-Al_(20)Cu_(2)Mn_(3)phase,whose number density increases over one *** significant segregation of Ni,Ce,and Zr elements at the interfaces helps improve the thermal stability of the T *** thermostable T phase effectively strengthens the matrix by in-hibiting dislocation ***,a highly interconnected 3D intermetallic network along the grain boundaries can still remain after long-term re-aging at 300℃,which is conducive to imposing a drag on the grain boundaries at high *** finding offers a viable route for enhancing the elevated-temperature strength of heat-resistant aluminum alloys,which could provide expanded opportunities for higher-temperature applications.

关键词： Aluminum alloys Precipitation Thermally reinforcement phase Re-aging treatment High-temperature strength

Mechanical behavior of TiAl alloys

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Science China(Technological Sciences) 2023年第9期66卷 2457-2480页

作者： XIANG HengGao CHEN Yang qi zhixiang ZHENG Gong CHEN FengRui CAO YueDe LIU Xu ZHOU Bing CHEN Guang National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China

Intermetallic TiAl alloys attract much attention in advanced engineering fields due to their low density(3.9–4.2 g/cm3) and excellent high-temperature properties. After more than half a century of research and development, TiAl alloys have found applications in aerospace, automotive, and related industries. However, as a kind of semi-brittle materials, intermetallic TiAl alloys exhibit different mechanical behavior from metallic and ceramic materials. Thus, it is necessary to systematically understand their mechanical behavior to ensure further developments and safe engineering applications. In this paper, the principal mechanical behavior of Ti Al alloys was reviewed comprehensively, including tension, creep, fatigue, and strengthening mechanisms. The mechanical performance and the corresponding deformation mechanisms are summarized and discussed in detail. The future directions of mechanical research on TiAl alloys are also overviewed to expedite their extensive utilization in engineering fields.

关键词： TiAl tension creep fatigue strengthening mechanisms

Dynamic mechanical behavior, microstructure evolution, and restoration mechanism of a β‐Ti alloy during hot compression deformation

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International Journal of Mechanical System Dynamics 2022年第4期2卷 325-338页

作者： Xi Pan Pei Li Yang Chen zhixiang qi Hao Xu Yuede Cao Yuan Lei Gong Zheng Guang Chen MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials and DesignMinistry of EducationNanjing University of Science and TechnologyNanjingChina

Metastable β titanium alloys are promising materials for lightweight and energy‐efficient applications due to their high strength and low ***-mechanical processing(TMP)is one of the most effective ways to improve the mechanical properties of such *** paper describes a systematic TMP investigation on a new metastableβtitanium alloy,including its dynamic mechanical behavior,and microstructure evolution,via isothermal compression tests and electron back‐scattered diffraction *** results show that the compression stress increases with an increase in the strain rate and a decrease in the *** yielding,the compression stress-strain pattern shows flow‐softening behavior at a low temperature and a high strain rate,while sustaining a steady flow state at a high temperature and a low strain *** temperature‐rise effect contributes to a large degree of flow softening at high strain *** the correction for temperature rise,the stress-strain constitutive relationships are established,showing that the compression behavior varies in different phase *** on the microstructure characterizations,it is found that the dynamic recovery and dynamic recrystallization dominate the hot deformations inβphase region and at low strain rates,while the deformation band as an additional product is found inα+βphase region and at high strain *** results contribute to a better understanding of the TMP for the considered alloy and may also represent a useful database forβ‐Ti alloy applications in lightweight mechanical systems.

关键词： metastableβtitanium alloy dynamic mechanical behavior microstructure evolution restoration mechanism

百岁忧患,道德文章——徐中玉先生学术谱系的历时把握与共时解读

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文艺理论研究 2015年第1期35卷 6-16页

作者：祁志祥上海政法学院上海政法学院国学研究所

百岁老人徐中玉先生是当代中国学人的杰出代表。本文以六卷本《徐中玉文集》为主要依据,按历时与共时的方法,从百年社会风云的变幻入手,分析、概述了徐中玉先生的学术生平、文艺主张、学术结构和治学方法。徐中玉先生的一生,可分为五个... 详细信息

百岁老人徐中玉先生是当代中国学人的杰出代表。本文以六卷本《徐中玉文集》为主要依据,按历时与共时的方法,从百年社会风云的变幻入手,分析、概述了徐中玉先生的学术生平、文艺主张、学术结构和治学方法。徐中玉先生的一生,可分为五个阶段,三个学术高峰。徐中玉先生的基本文艺思想,是主张文学对社会进步发挥积极作用,倡导艺术民主和学术自由,强调实事求是、独立思考。徐中玉先生的学术成就,依次体现为抗战文论、苏俄文论、古代文论、现代文论四个板块,它们互有转换与联系,构成了其学术结构。徐中玉先生的治学方法,体现为纯粹研究与实际应用的统一、微观分析与宏观综合的结合、实证与贯通的融合、思辨体系与感受札记的兼顾,以及内容与形式、他律与自律的兼顾。徐中玉的学术不是纯学术,一生遭逢忧患注定了其道德文章的整体品格。

关键词：徐中玉学术生平文艺主张学术结构治学方法

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“五四”时期现代文艺学学科的诞生

文艺理论研究 2019年第2期39卷 49-56页

作者：祁志祥上海政法学院应用社会科学院

从1915年到1927年'五四'前后这段时期,是中国现代文艺学科宣告诞生的阶段。本文以黄忏华的《美术概论》、徐庆誉的《美的哲学》、徐蔚南的《艺术哲学》以及刘永济的《文学论》、潘梓年的《文学概论》、马宗霍的《文学概论》、沈天葆的... 详细信息

从1915年到1927年'五四'前后这段时期,是中国现代文艺学科宣告诞生的阶段。本文以黄忏华的《美术概论》、徐庆誉的《美的哲学》、徐蔚南的《艺术哲学》以及刘永济的《文学论》、潘梓年的《文学概论》、马宗霍的《文学概论》、沈天葆的《文学概论》、田汉的《文学概论》为抓手,探讨研究中国现代美学史上第一阶段艺术哲学建设的历史状况,这对人们认识现代文艺学科在中国的由来及其走向具有重要的参考意义。

关键词： 1920年代中国艺术哲学文学概论

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“乐感美学”原理的逻辑建构

文艺理论研究 2016年第3期36卷 34-43页

作者：祁志祥上海政法学院研究院

本文系笔者试图重构的新美学原理"乐感美学"的总论,旨在提纲挈领地说明"乐感美学"原理的逻辑结构。本文认为,美学是美的哲学。美的最基本的性能是产生乐感。因此,美学原理可名之为"乐感美学原理"。在辨明美学的学科定义、标举解构之后... 详细信息

本文系笔者试图重构的新美学原理"乐感美学"的总论,旨在提纲挈领地说明"乐感美学"原理的逻辑结构。本文认为,美学是美的哲学。美的最基本的性能是产生乐感。因此,美学原理可名之为"乐感美学原理"。在辨明美学的学科定义、标举解构之后重构的建设性后现代方法论的基础上,本文揭示了美是"有价值的乐感对象"这一基本语义;并由此出发,对美的范畴、原因、规律、特征、形态、领域、风格及美感活动特点等作了逻辑一贯、首尾呼应的分析阐释,为填补反本质的解构主义美学留下的巨大真空提供了一份建设性的系统思考成果。

关键词：乐感美学逻辑结构

文学本体问题的理论反思——以钱中文先生《文学理论:求索与反思》为个案

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文艺理论研究 2014年第4期34卷 78-84页

作者：祁志祥上海政法学院研究院

本文以《文学理论:求索与反思》一书为个案,系统梳理、评述了钱中文先生新世纪以来关于文学本体一系列重要问题的反思与论辩。这些问题包括:文学有没有自己的"本质"?文学的"本质"问题是不是可以探讨?"反本质主义"是否意味着取消"本质"研... 详细信息

本文以《文学理论:求索与反思》一书为个案,系统梳理、评述了钱中文先生新世纪以来关于文学本体一系列重要问题的反思与论辩。这些问题包括:文学有没有自己的"本质"?文学的"本质"问题是不是可以探讨?"反本质主义"是否意味着取消"本质"研究?如果文学的"本质"研究不可取消,那么文学的"本质"是什么?如何评价本质解构之后文学的边界和文学理论的扩容?如何从文学在人类精神生活中的地位看待"文学终结"、"文学理论死了"之类的耸听危言?作为中国文论界的领军人物,钱中文先生晚年调动一生的学术积累回应了这些问题,值得我们认真研究和参考。

关键词：文学本质审美意识新理性精神文学边界理论扩容文学终结

周代“以人为本”的天人之辩——兼与葛兆光、赵法生先生商榷

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东南学术 2022年第1期 226-236页

作者：祁志祥上海交通大学人文学院上海交通大学人文艺术研究院上海市美学学会

“天人关系”是周代思想界思考论辩的重要问题。周代的天、人之辩既包括神、人之辩,又涉及“人与自然”的关系。周代的天人之辩从“尊天敬神”“以人法天”出发,发展到神人并尊、天人并尊,最终发展到否认鬼神的作用,降低“天时地利”的... 详细信息

“天人关系”是周代思想界思考论辩的重要问题。周代的天、人之辩既包括神、人之辩,又涉及“人与自然”的关系。周代的天人之辩从“尊天敬神”“以人法天”出发,发展到神人并尊、天人并尊,最终发展到否认鬼神的作用,降低“天时地利”的地位,肯定“吉凶由人”,主张“贵人先人”。在“天人感应”与“天人相分”、“以人法天”与“以人定天”的互动建构中,周代的“天人合一”完成了向“以人为本”的转变。周代天人之辩中体现的“人本”倾向,使得葛兆光的殷周文化一体论以及赵法生的周代伦理宗教“天民平衡”的新论不攻自破。

关键词：周代神人关系循天顺人吉凶由人天人合一以人为本