热等静压参数对<strong>Ti<sub>2</sub>AlNb</strong>粉末合金力学性能的影响

doi:10.11901/1005.3093.2025.365

材料研究学报

2026, Vol. 40

Issue (9): 653-664 DOI: 10.11901/1005.3093.2025.365

研究论文

本期目录 | 过刊浏览

热等静压参数对Ti₂AlNb粉末合金力学性能的影响

李冰冰¹^,², 徐磊², 尹一峰¹^,², 田晓生², 卢正冠², 吴杰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师昌绪先进材料创新中心沈阳 110016

Effect of Process Parameters on Microstructure and Mechanical Properties of Hot Isostatic Pressing Powder Ti₂AlNb Alloy

LI Bingbing¹^,², XU Lei², YIN Yifeng¹^,², TIAN Xiaosheng², LU Zhengguan², WU Jie²(

)

^1.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

李冰冰, 徐磊, 尹一峰, 田晓生, 卢正冠, 吴杰. 热等静压参数对Ti₂AlNb粉末合金力学性能的影响[J]. 材料研究学报, 2026, 40(9): 653-664.
Bingbing LI, Lei XU, Yifeng YIN, Xiaosheng TIAN, Zhengguan LU, Jie WU. Effect of Process Parameters on Microstructure and Mechanical Properties of Hot Isostatic Pressing Powder Ti₂AlNb Alloy[J]. Chinese Journal of Materials Research, 2026, 40(9): 653-664.

全文: PDF(22319 KB) HTML

摘要:

用无坩埚感应熔炼超声气体雾化法制备洁净的Ti₂AlNb预合金粉末，然后对其进行不同工艺参数的热等静压(HIP)制备出粉末合金，使用扫描电镜、场发射扫描电镜、透射电子显微镜、氧氮氢分析仪、激光衍射粒度分析仪、X射线三维成像系统、场发射电子探针、超高温综合热分析仪以及万能试验机等手段表征了Ti₂AlNb预合金粉末和Ti₂AlNb粉末合金的组织和性能，研究了热等静压参数(温度、保温时间)和二次热等静压对Ti₂AlNb粉末合金的显微组织演变和力学性能的影响。结果表明：这种Ti₂AlNb预合金粉末的球形度良好、氧含量低(0.072%)，其显微组织主要由亚稳B2相构成。当HIP温度从1030 ℃提高到1050 ℃时，粉末合金中的B2相体积分数从26.8%提高到31.2%，室温抗拉强度提高到1168 MPa，650 ℃延伸率提高到11.2%；将保温时间从3 h延长至5 h，α₂相含量降低到12.0%，室温延伸率标准差从±2.7%减少到±1.2%，表明其力学性能的稳定性显著提高。二次热等静压处理促进了O相在α₂/B2相界处优先形核和析出，并使α₂相组织的尺寸分布呈现峰宽增加的单峰特征。TEM分析表明，O相与母相间存在特定的晶体学取向关系[ $2 1 ¯ 1 ¯ 0$ ] $α 2$ //[ $1 ¯ 1 ¯ 0$ ]_O和[ $111$ ]_B2//[ $1 ¯ 1 ¯ 0$ ]_O，证实了O相可通过两种路径析出。

关键词 ：金属材料, 粉末冶金, Ti₂AlNb合金, 热等静压, 显微组织

Abstract：

To address the performance inconsistency in hot isostatic pressing powder Ti₂AlNb alloys, herein, the influence of processing parameters on the performance of the HIP powder Ti₂AlNb alloys was clarified so that to achieve the process optimization. First, the clean powder pre-alloyed Ti₂AlNb was prepared by electrode induction melting gas atomization (EIGA) technique. The acquired powder exhibited excellent sphericity, low oxygen content (0.072%), and a microstructure predominantly composed of metastable B2 phase. Then the effect of hot isostatic pressing (HIP) parameters (temperature and holding time) and a secondary HIP treatment on the microstructural evolution and mechanical properties of HIP powder Ti₂AlNb alloy was investigated, aiming to precisely control over the B2/O/α₂ three-phase microstructure. The results indicate that with the increasing HIP temperature from 1030 ^oC to 1050 ^oC, the volume fraction of B2-phase increases from 26.8% to 31.2% in the consolidated alloy, which was accompanied by a rise in room-temperature tensile strength to 1168 MPa and an improvement in elongation at 650 ^oC to 11.2%. With the prolonging HIP holding time from 3 h to 5 h, the fraction of α₂-phase reduced to 12.0% and the standard deviation of room-temperature elongation decreased from ±2.7% to ±1.2%, significantly enhancing the consistency of mechanical properties. The secondary HIP effectively promoted the preferential nucleation and precipitation of O-phase at α₂/B2-phase boundaries, resulting in α₂ -phase microstructure with a broadened unimodal size distribution. TEM analysis revealed the specific crystallographic orientation relationships between the O-phase and parent phases: [ $2 1 ¯ 1 ¯ 0$ ] $α 2$ //[ $1 ¯ 1 ¯ 0$ ]_O and [ $111$ ]_B2//[ $1 ¯ 1 ¯ 0$ ]_O, confirming that the O-phase can form via two distinct precipitation pathways. This study elucidates the mechanisms by which HIP process parameters influence the microstructure evolution of the Ti₂AlNb alloy, providing meaningful reference for the fabrication of high-performance Ti₂AlNb alloy components.

Key words： metallic materials powder metallurgy Ti₂AlNb alloy hot isostatic pressing microstructure

收稿日期: 2025-12-08

ZTFLH:

TG146.2

基金资助:国家科技重大专项(2025ZD0610602);中国科学院重点部署项目(KGFZD-145-25-26);中国科学院重点部署项目(RCJJ-145-24-39);中国科学院稳定支持基础研究领域青年团队计划(YSBR-025);辽宁省科技重大专项(2024JH1/11700027)

通讯作者: 吴杰，副研究员，jwu10s@imr.ac.cn，研究方向为粉末高温结构材料近净成形工艺

Corresponding author: WU Jie, Tel: (024)83978073, E-mail: jwu10s@imr.ac.cn

作者简介: 李冰冰，女，2001年生，硕士生

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表1 Ti2AlNb预合金粉末和压坯中杂质的含量

图1 Ti2AlNb预合金粉末的表征

图2 Ti2AlNb预合金粉末的DSC曲线

Process	Temperature	Pressure	Holding time	Cooling method
HIP1	1010 ^oC/1 h $3 o C / m i n$ 1030 ^oC	140-150 MPa	3 h	Furnace cooling
HIP2	1010 ^oC/1 h $3 o C / m i n$ 1050 ^oC	140-150 MPa	3 h	Furnace cooling
HIP3	1010 ^oC/1 h $3 o C / m i n$ 1030 ^oC	140-150 MPa	5 h	Furnace cooling
Secondary HIP	930 ^oC/2 h $3 o C / m i n$ 1010 ^oC	140-150 MPa	1 h	Controlled cooling

表2 制备粉末Ti2AlNb合金的HIP工艺参数

图3 HIP的工艺路线

图4 用两种HIP工艺制备的Ti2AlNb合金的显微组织

图5 用两种HIP工艺制备的Ti2AlNb合金相的相对含量和晶粒尺寸

图6 用HIP3工艺制备的Ti2AlNb合金的显微组织和晶粒统计

表3 不同HIP 参数的Ti2AlNb合金的力学性能

Process	τ / h						$τ ¯$ / h
Before secondary HIP	43.98	48.20	48.20	49.59	58.58	69.13	52.95
After secondary HIP	42.18	49.95	65.13	66.98	68.58	70.65	60.58

表4 二次HIP前后Ti2AlNb合金的持久寿命

图7 二次HIP后Ti2AlNb合金的显微组织和晶粒尺寸分布

图8 二次HIP前后Ti2AlNb合金的TEM照片

图9 二次HIP前后Ti2AlNb合金的力学性能

图10 用不同参数的HIP工艺制备的Ti2AlNb合金的显微组织演变示意图

图11 用Ti2AlNb粉末合金制造的叶轮、叶盘和矩形环

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