<strong>Hf</strong>元素掺杂对<strong>TiSc</strong>合金调幅分解的影响

doi:10.11901/1005.3093.2025.103

材料研究学报

2025, Vol. 39

Issue (12): 901-908 DOI: 10.11901/1005.3093.2025.103

研究论文

本期目录 | 过刊浏览

Hf元素掺杂对TiSc合金调幅分解的影响

王昱坤¹^,², 段慧超¹^,²(

), 杜奎¹^,²

^1.中国科学技术大学材料科学与工程学院沈阳 110016
^2.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016

Influence of Hf Doping on Spinodal Decomposition of TiSc Alloy

WANG Yukun¹^,², DUAN Huichao¹^,²(

), DU Kui¹^,²

^1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

王昱坤, 段慧超, 杜奎. Hf元素掺杂对TiSc合金调幅分解的影响[J]. 材料研究学报, 2025, 39(12): 901-908.
Yukun WANG, Huichao DUAN, Kui DU. Influence of Hf Doping on Spinodal Decomposition of TiSc Alloy[J]. Chinese Journal of Materials Research, 2025, 39(12): 901-908.

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摘要:

用透射电子显微镜、扫描电子显微镜和X射线衍射仪等手段表征掺杂不同含量Hf的TiSc合金的微观结构，研究了Hf掺杂对其调幅分解的影响。结果表明，随着Hf元素含量从0提高到10% (原子分数)，TiSc合金调幅分解产生的片层组织的宽度呈增大的趋势，α-Ti和α-Sc调幅分解结构由片层分别转变为网格状和块状组织。转变为网格状组织可归因于Hf元素的添加降低了调幅分解的化学驱动力和Ti、Sc原子间的晶格错配度，使体系产生更大范围的成分波动和增大了调幅分解组织的片层宽度；转变为块状组织可归因于低扩散性Hf元素均匀固溶于TiSc合金降低了体系的扩散速率，使α-Ti和α-Sc的调幅分解结构发生转变。同时，随着合金片层组织宽度的增大其维氏硬度从375.37HV降低到281.11HV。这表明，Hf元素的添加改变了TiSc合金的微观组织结构从而影响其硬度。

关键词 ：金属材料, 调幅分解, 电子显微学, TiSc合金, 元素掺杂

Abstract：

Spinodal decomposition enables the formation of continuous nanoscale dual-phase structures with periodic compositional fluctuations, a unique microstructure that significantly enhances mechanical properties such as strength, hardness, and creep resistance of alloys. Consequently, tailoring spinodal decomposition to optimize mechanical performance has emerged as a central objective in materials research. While compositional control is vital to this process, and elemental doping provides a precise strategy to regulate the decomposition behavior, the mechanism related with interactions between dopants and spinodal dynamics remains elusive. In this study, the evolution of nanoscale lamellar microstructures in Hf-doped TiSc alloys (0-10% Hf, in atomic fraction) was systematically investigated by using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD), as well as Vickers hardness measurements. The results demonstrate that with the increase of Hf content from 0 to 10%, the lamellar structure width formed by spinodal decomposition in TiSc alloys exhibits a progressive growth trend. Meanwhile, the spinodal decomposition structures of α-Ti and α-Sc undergo morphological transitions from lamellar to interconnected network and blocky morphologies, respectively. The former phenomenon may be attributed to that both the chemical driving force for spinodal decomposition and the lattice mismatch between Ti and Sc atoms may be reduced by the addition of Hf, which may thermodynamically facilitate the occurrence of larger-scale compositional fluctuations within the system, as a consequence, the lamellar width of spinodal decomposition structures is then increased. The latter transformation may be raised from the homogeneous solid solution of low-diffusivity Hf atoms in the TiSc matrix, which significantly decreases the overall diffusion rate of the system, thereby promoting structural evolution in both α-Ti and α-Sc spinodal decomposition phases. Furthermore, the Vickers hardness continuously decreases from 375.37HV to 281.11HV with the widening of lamellar structures, indicating that Hf addition alters the microstructural characteristics and consequently affects the mechanical properties of TiSc alloys.

Key words： metallic materials spinodal decomposition electron microscopy TiSc alloy element doped

收稿日期: 2025-03-11

ZTFLH:

TG146.2

基金资助:国家科技重大专项(2019VI00060120);国家重点研发计划(2024YFA1208002);辽宁省自然科学基金(2023-BS-010)

通讯作者: 段慧超，副研究员，hcduan15s@imr.ac.cn，研究方向为金属材料的电子显微学分析

Corresponding author: DUAN Huichao, Tel: (024)83978628, E-mail: hcduan15s@imr.ac.cn

作者简介: 王昱坤，男，2000年生，硕士生

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图1 不同Hf元素含量TiSc合金的SEM背散射电子图像

图2 不同Hf元素含量TiSc合金的TEM明场像

图3 不同Hf元素含量TiSc合金中Ti片层宽度的分布

图4 不同Hf元素含量TiSc合金的EDS分析

图5 Hf元素在不同合金中的占比以及不同合金中α-Ti和α-Sc的Ti/Sc比值

图6 不同Hf元素含量TiSc合金的XRD谱

图7 不同Hf元素含量TiSc合金的维氏硬度

图8 维氏硬度与平均片层宽度的关系

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