亚稳 <strong><i>β</i></strong> 钛合金热处理显微组织演变和元素再分配行为

doi:10.11901/1005.3093.2022.080

材料研究学报

2023, Vol. 37

Issue (3): 161-167 DOI: 10.11901/1005.3093.2022.080

研究论文

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亚稳 β 钛合金热处理显微组织演变和元素再分配行为

张瑞雪¹^,², 马英杰², 贾焱迪², 黄森森², 雷家峰², 邱建科², 王平¹(

), 杨锐²

^1.东北大学材料电磁过程研究教育部重点实验室沈阳 110819
^2.中国科学院金属研究所沈阳 110016

Microstructure Evolution and Element Partitioning Behavior during Heat-treatment in Metastable β Titanium Alloy

ZHANG Ruixue¹^,², MA Yingjie², JIA Yandi², HUANG Sensen², LEI Jiafeng², QIU Jianke², WANG Ping¹(

), YANG Rui²

^1.Key Laboratory of EPM, Ministry of Education, Northeastern University, Shenyang 110819, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

张瑞雪, 马英杰, 贾焱迪, 黄森森, 雷家峰, 邱建科, 王平, 杨锐. 亚稳 β 钛合金热处理显微组织演变和元素再分配行为[J]. 材料研究学报, 2023, 37(3): 161-167.
Ruixue ZHANG, Yingjie MA, Yandi JIA, Sensen HUANG, Jiafeng LEI, Jianke QIU, Ping WANG, Rui YANG. Microstructure Evolution and Element Partitioning Behavior during Heat-treatment in Metastable β Titanium Alloy[J]. Chinese Journal of Materials Research, 2023, 37(3): 161-167.

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摘要:

研究了在不同固溶及时效热处理条件下Ti-5Al-5Mo-5V-3Cr-0.6Fe亚稳β钛合金的显微组织演变和元素的再分配行为。在β单相区固溶保温后炉冷至(α+β)两相区的两阶段固溶处理，合金中生成了连续粗大的α晶界(α_GB)和少量的晶内初生α相(α_p)；进一步进行低温/高温两阶段的时效热处理，在低温时效过程中初步形成的ω相对在高温终时效过程中生成的次生α(α_s)片层尺寸有显著的影响。用电子探针显微分析表征热处理过程中α相和β相之间的元素再分配行为并讨论了对上述显微组织演变的影响。结果表明，在固溶热处理过程中α_GB和α_p附近的元素再分配使α相附近局部β稳定元素的含量较高，提高了该区域β基体的稳定性，在低温时效过程中出现了无ω相析出的区域。在高温终时效过程中，在ω相辅助形核的作用下晶内析出的α_s片层尺寸较小，而在α_GB附近约2 μm范围内，因没有ω相的辅助生成的α_s片层尺寸较大。

关键词 ：金属材料, 亚稳β钛合金, 元素再分配, ω相, 组织演变

Abstract：

The phase transformation of high-strength Ti-alloy is complex and closely related to the element partitioning during heat-treatment. The microstructure evolution and element partitioning behavior of metastable Ti-alloy Ti-5Al-5Mo-5V-3Cr-0.6Fe, being subjected to different solution and aging treatments were studied. The results showed that after β solution-treatment followed by furnace cooling to (α+β) solution-treatment, α grain boundary (α_GB) and a small amount of intracrystalline primary α(α_p) could form in the alloy. Next, after a two-stage aging-treatment at low-temperature and high-temperature, the ω-phase precipitated during low-temperature aging could affect the size of secondary α(α_s)-lamellar formed during high-temperature aging. The electron probe microanalysis was used to characterize the typical element partitioning effect occurred between α- and β-phase, during solution-treatment, and of which the influence on the microstructure evolution is discussed. The element partitioning behavior led to higher content of β stabilizing elements near α_GB and α_p, which improved the stability of β matrix in the above region. The precipitation free zone formed near α_GB and α_p during low-temperature. After high-temperature aging, the refined α_s precipitated away from α_GB induced by the ω-phase assisted nucleation. While the size of α_s was larger within 2 μm nearby α_GB owning to the absence of ω-assisted nucleation.

Key words： metallic materials metastable β titanium alloy element partitioning ω phase microstructure evolution

收稿日期: 2022-01-28

ZTFLH:

TG146.2

基金资助:国家自然科学基金(51871225);中国科学院A类先导专项(XDA22010101)

通讯作者: 王平，教授，wping@epm.neu.edu.cn，研究方向为有色金属组织演变与性能优化

Corresponding author: WANG Ping, Tel: 13340029004, E-mail: wping@epm.neu.edu.cn

作者简介: 张瑞雪，女，1992年生，博士生

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表1 实验用Ti-5553-0.6Fe合金的化学成分

表2 实验用Ti-5553-0.6Fe合金的热处理工艺参数

图1 经单相区固溶后Ti-5553-0.6Fe合金的金相组织

图2 Ti-5553-0.6Fe合金固溶条件下的SEM显微形貌

图3 低温时效Ti-5553-0.6Fe合金的SEM和TEM显微形貌

图4 终时效后Ti-5553-0.6Fe合金的SEM显微形貌

图5 Ti-5553-0.6Fe固溶样品在持续升温过程中的DSC曲线

图6 经不同热处理后Ti-5553-0.6Fe合金中元素的分布

图7 在固溶和低温时效条件下Ti-5553-0.6Fe合金αGB附近沿图6中箭头方向元素浓度的变化

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