<strong>O</strong>含量对<strong>Ti2448</strong>合金时效析出行为及力学性能的影响

doi:10.11900/0412.1961.2024.00107

金属学报

2025, Vol. 61

Issue (12): 1790-1802 DOI: 10.11900/0412.1961.2024.00107

研究论文

本期目录 | 过刊浏览

O含量对Ti2448合金时效析出行为及力学性能的影响

李丹¹^,², 宫得伦¹, 郝玉琳¹(

)

1 中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
2 中国科学技术大学材料科学与工程学院沈阳 110016

Effect of O Content on the Aging Precipitation Behavior and Mechanical Properties of Ti2448 Alloy

LI Dan¹^,², GONG Delun¹, HAO Yulin¹(

)

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

引用本文:

李丹, 宫得伦, 郝玉琳. O含量对Ti2448合金时效析出行为及力学性能的影响[J]. 金属学报, 2025, 61(12): 1790-1802.
Dan LI, Delun GONG, Yulin HAO. Effect of O Content on the Aging Precipitation Behavior and Mechanical Properties of Ti2448 Alloy[J]. Acta Metall Sin, 2025, 61(12): 1790-1802.

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摘要:

为探究O含量对经双步热处理后Ti2448合金时效析出行为及力学性能的影响，选取2种不同O含量的Ti2448合金(LO：0.08%和HO：0.33%，质量分数)为研究对象，分别采用873和923 K退火10 min + 773 K时效1~4 h的热处理工艺，通过XRD、SEM、TEM和拉伸性能测试等方法，研究合金的组织演化行为和力学性能变化。结果表明，O含量对热处理前合金的相组成与晶粒尺寸影响较小，但提高O含量能抑制合金的双屈服特征并提升合金强度与弹性模量。经双步热处理后，2种O含量合金均析出致密的片层状析出相，伴有模量硬化与时效强化；O含量对析出相的初始厚度影响较小，但影响析出相在后续时效过程的粗化行为。相同热处理制度下，Ti2448-HO合金析出相的体积分数更高，进而贡献更强的模量硬化与时效强化，因此时效态Ti2448-HO合金具有更高的弹性模量与强度。

关键词 ：亚稳β型钛合金, O含量, 热处理, 析出相, 力学性能

Abstract：

Metastable β-titanium alloys are widely used in advanced biomedical applications because of their high strength and low modulus. Strength improvements in these alloys are mainly achieved through α-phase precipitation. Interestingly, a novel α″ + β dual-phase microstructure has been discovered in a multifunctional Ti2448 alloy after aging treatments, which effectively enhanced the strength while maintaining decent ductility. Since O plays a crucial role in regulating the decomposition and mechanical properties of titanium alloys, understanding its effects on the microstructural evolution and mechanical behavior of Ti2448 alloys is of great importance. However, the effect of O on the decomposition behavior of the Ti2448 alloy remains unclear. To investigate the influence of O content on the microstructure evolution and mechanical properties of the Ti2448 alloy, two Ti2448 alloys with different oxygen contents were selected: low oxygen (LO: 0.08%, mass fraction) and high oxygen (HO: 0.33%, mass fraction). This study employed a two-step heat treatment (annealing at 873/923 K for 10 min, followed by aging at 773 K for 1-4 h) on Ti2448-LO and Ti2448-HO alloys, focusing on the evolution of their microstructure and mechanical properties. Results indicated that O content minimally influenced the phase composition and grain size of the alloys before heat treatment. However, increasing the O content considerably suppressed the double yield phenomenon and enhanced the strength and elastic modulus of the alloy. After the two-step heat treatment, both alloys exhibited the precipitation of dense lamellar phases, resulting in remarkable modulus hardening and aging strengthening. Although the initial thickness of the precipitated phase was relatively unaffected by the O content, its subsequent coarsening behavior during aging was influenced. Under the same heat treatment conditions, the Ti2448-HO alloy exhibited a higher volume fraction of precipitates, leading to stronger modulus hardening and aging strengthening. Consequently, the aged Ti2448-HO alloy exhibited higher elastic modulus and strength than the Ti2448-LO alloy.

Key words： metastable β titanium alloy O content heat treatment precipitate mechanical property

收稿日期: 2024-04-15

ZTFLH:

TG156.1

基金资助:国家自然科学基金项目(U2341259)

通讯作者: 郝玉琳，ylhao@imr.ac.cn，主要从事生物医用钛合金的研究

Corresponding author: HAO Yulin, professor, Tel: (024)83978841, E-mail: ylhao@imr.ac.cn

作者简介: 李丹，女，1995年生，博士

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表1 Ti2448合金化学成分 (mass fraction / %)

图1 不同O含量Ti2448合金的双步热处理工艺示意图

图2 热轧态Ti2448-LO和Ti2448-HO合金的电子通道衬度成像(ECCI)像

图3 热轧态Ti2448-LO和Ti2448-HO合金的TEM像及选区电子衍射(SAED)花样

图4 热轧态Ti2448-LO和Ti2448-HO合金的XRD谱

图5 热轧态Ti2448-LO和Ti2448-HO合金的工程应力-应变曲线

表2 热轧态Ti2448-LO和Ti2448-HO合金的弹性模量和硬度

图6 873 K退火10 min后Ti2448-LO和Ti2448-HO合金的ECCI像

图7 923 K退火10 min后Ti2448-LO和Ti2448-HO合金的ECCI像

图8 873和923 K退火10 min后Ti2448-LO和Ti2448-HO合金的XRD谱

图9 873 K、10 min + 773 K、1 h双步热处理后Ti2448-LO合金中析出相的TEM像和SEAD花样

图10 873 K、10 min + 773 K、1 h双步热处理后Ti2448-HO合金中析出相的TEM像和SAED花样

图11 873 K、10 min + 773 K、1~4 h双步热处理后Ti2448-LO和Ti2448-HO合金的ECCI像及经MIPAR软件处理后的ECCI像

图12 923 K、10 min + 773 K、1~4 h双步热处理后Ti2448-LO和Ti2448-HO合金的ECCI像

表3 873 K、10 min + 773 K、1~4 h双步热处理后2种合金中析出相的厚度、数密度及体积分数

图13 不同热处理制度下Ti2448-LO和Ti2448-HO合金弹性模量随时效时间的演化

图14 不同热处理制度下Ti2448-LO和Ti2448-HO合金硬度随时效时间的演化

图15 不同热处理制度下Ti2448-LO和Ti2448-HO合金的工程应力-应变曲线

表4 923 K、10 min + 773 K、 1~4 h双步热处理后2种合金中析出相的厚度、数密度及体积分数

表5 不同热处理制度下Ti2448-LO和Ti2448-HO合金的室温力学性能

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