聚片孪生功能基元序构的高性能<strong>TiAl</strong>合金

doi:10.11900/0412.1961.2026.00048

金属学报

2026, Vol. 62

Issue (4): 541-549 DOI: 10.11900/0412.1961.2026.00048

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聚片孪生功能基元序构的高性能TiAl合金

陈光¹^,²^,³(

), 陈奉锐¹^,²^,³(

), 朱德民¹^,²^,³, 李贵忠¹^,²^,³, 李罗¹^,²^,³, 宋伟东¹^,²^,³, 王子特¹^,²^,³, 相恒高¹^,²^,³, 陈旸¹^,²^,³, 祁志祥¹^,²^,³

^1.南京理工大学高温轻合金及应用技术全国重点实验室南京研究基地南京 210094
^2.南京理工大学高端装备铸造技术全国重点实验室南京 210094
^3.南京百炼实验室南京 210094

Polysynthetic Twinned High-Performance TiAl Alloy with Ordered Structures of Functional Units

CHEN Guang¹^,²^,³(

), CHEN Fengrui¹^,²^,³(

), ZHU Demin¹^,²^,³, LI Guizhong¹^,²^,³, LI Luo¹^,²^,³, SONG Weidong¹^,²^,³, WANG Zite¹^,²^,³, XIANG Henggao¹^,²^,³, CHEN Yang¹^,²^,³, QI Zhixiang¹^,²^,³

^1.State Key Laboratory of Light Superalloys, Nanjing Research Base, Nanjing University of Science and Technology, Nanjing 210094, China
^2.State Key Laboratory of Advanced Casting Technologies, Nanjing University of Science and Technology, Nanjing 210094, China
^3.Nanjing Belight Laboratory, Nanjing 210094, China

引用本文:

陈光, 陈奉锐, 朱德民, 李贵忠, 李罗, 宋伟东, 王子特, 相恒高, 陈旸, 祁志祥. 聚片孪生功能基元序构的高性能TiAl合金[J]. 金属学报, 2026, 62(4): 541-549.
Guang CHEN, Fengrui CHEN, Demin ZHU, Guizhong LI, Luo LI, Weidong SONG, Zite WANG, Henggao XIANG, Yang CHEN, Zhixiang QI. Polysynthetic Twinned High-Performance TiAl Alloy with Ordered Structures of Functional Units[J]. Acta Metall Sin, 2026, 62(4): 541-549.

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摘要:

发展具有变革性的TiAl合金是航空发动机叶片等热端部件的重点方向，对航空航天高端装备轻量化具有重大意义。针对传统TiAl合金室温脆性大和长时承温能力低两大世界难题，本团队基于“功能基元序构”材料设计新范式，通过精确调控软相γ-TiAl、硬相α₂-Ti₃Al及纳米孪晶等功能基元本征特性和序构参数，显著提升了聚片孪生(polysynthetic twinned，PST) TiAl合金的强塑性和承温能力。发现了界面类型、片层取向、片层厚度及相比例等序构参数对合金力学性能的决定性作用，澄清了γ相孪生诱导强塑性、α₂相层错提高疲劳强度、α₂相变增韧及γ/α₂共格界面提高断裂韧性等强韧化物理机制，为探索功能基元序构的高性能TiAl合金探明了方向。最后，展望了TiAl合金功能基元序构的发展方向。

关键词 ：聚片孪生TiAl合金, 功能基元, 序构, 强韧化, 力学性能

Abstract：

Transformative TiAl alloys are in high demand for hot-end components such as aeroengine blades and for lightweighting advanced aerospace equipment. However, traditional TiAl alloys are brittle at room temperature and exhibit low long-term capability at high temperatures. To overcome these limitations, our team has proposed a new material-design paradigm based on “ordered structures of functional units.” By precisely regulating the intrinsic characteristics and ordered structures of the soft γ-TiAl phase, the hard α₂-Ti₃Al phase, and nano-twins, we considerably enhance the strength, plasticity, and high-temperature capability of polysynthetic twinned TiAl alloys. We also demonstrate the decisive roles of ordered-structure parameters, such as interface type, lamellar orientation, lamellar thickness, and phase proportion, on the mechanical properties of the alloy. The physical strengthening and toughening mechanisms include twinning-induced strengthening and plasticity in the γ phase, fatigue-strength-enhancing stacking faults in the α₂ phase, toughening via transformation of the α₂ phase, and γ/α₂ coherent interfaces, which improve fracture toughness. These insights illuminate promising directions for the development of TiAl alloys with ordered functional unit structures.

Key words： polysynthetic twinned TiAl alloy functional unit ordered structure strengthening and toughening mechanical property

收稿日期: 2026-02-09

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(92463301);国家自然科学基金项目(92163215);国家自然科学基金项目(52595663);国家自然科学基金项目(52571145);国家自然科学基金项目(52433016);国家重点研发计划项目(2024YFB3713503);National Key Research and Development Program of China(2024YFB3713503);重点新材料研发及应用国家科技重大专项项目(2025ZD0608600);中国博士后科学基金面上项目(2025M784312);高温轻合金及应用技术全国重点实验室开放基金项目(sysjj2025101);高温轻合金及应用技术全国重点实验室开放基金项目(sysjj2025102);高温轻合金及应用技术全国重点实验室开放基金项目(sysjj2025201);高温轻合金及应用技术全国重点实验室开放基金项目(sysjj2025202);高温轻合金及应用技术全国重点实验室开放基金项目(sysjj2025203);江苏省卓越博士后计划项目;Jiangsu Funding Program for Excellent Postdoctoral Talent

通讯作者: 陈光，gchen@njust.edu.cn，主要从事金属材料与加工科学技术研究；
陈奉锐，cfr@njust.edu.cn，主要从事金属材料变形机理研究祁志祥，zxqi@njust.edu.cn，主要从事空天动力高温轻合金材料与应用技术研究

作者简介: 陈光，男，1962年生，教授，中国科学院院士

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	陈光
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	陈旸
	祁志祥
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https://www.ams.org.cn/CN/10.11900/0412.1961.2026.00048 或 https://www.ams.org.cn/CN/Y2026/V62/I4/541

图1 聚片孪生TiAl合金的功能基元类型[1,15,21,27]

图2 聚片孪生功能基元序构TiAl合金界面类型[29]

图3 序构参数对力学性能的影响[21,33,34]

图4 功能基元序构的高性能TiAl合金强韧化物理机制[1,18,27,37,38]

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