<strong>Sn</strong>含量对<strong>DD26</strong>单晶高温合金组织与性能的影响

doi:10.11901/1005.3093.2025.237

材料研究学报

2026, Vol. 40

Issue (3): 161-168 DOI: 10.11901/1005.3093.2025.237

研究论文

本期目录 | 过刊浏览

Sn含量对DD26单晶高温合金组织与性能的影响

金师行¹^,², 梅松³, 卢玉章², 黄亚奇², 郑伟², 申健²(

), 张健²(

)

^1.中国科学技术大学材料科学与工程学院合肥 230026
^2.中国科学院金属研究所沈阳 110016
^3.上海科技大学智造系统工程中心上海 201210

Effect of Sn on Microstructure and Properties of DD26 Nickel-based Single Crystal Superalloy

JIN Shihang¹^,², MEI Song³, LU Yuzhang², HUANG Yaqi², ZHENG Wei², SHEN Jian²(

), ZHANG Jian²(

)

^1.School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Center for Adaptive System Engineering, ShanghaiTech University, Shanghai 201210, China

引用本文:

金师行, 梅松, 卢玉章, 黄亚奇, 郑伟, 申健, 张健. Sn含量对DD26单晶高温合金组织与性能的影响[J]. 材料研究学报, 2026, 40(3): 161-168.
Shihang JIN, Song MEI, Yuzhang LU, Yaqi HUANG, Wei ZHENG, Jian SHEN, Jian ZHANG. Effect of Sn on Microstructure and Properties of DD26 Nickel-based Single Crystal Superalloy[J]. Chinese Journal of Materials Research, 2026, 40(3): 161-168.

全文: PDF(17869 KB) HTML

摘要:

用液态金属冷却(LMC)定向凝固工艺制备4种不同Sn含量(质量分数分别为0%、0.01%、0.05%、0.10%)的DD26镍基单晶高温合金，研究了Sn含量对其铸态和完全热处理态的显微组织、室温拉伸性能和975 ℃/255 MPa持久性能的影响。结果表明：随着Sn含量的提高DD26单晶合金的一次枝晶间距、γ/γ′共晶组织的含量、γ′相的平均尺寸和体积分数都没有显著的变化。铸态合金中的Sn元素与Ni基体元素未形成化合物，Sn以固溶态在枝晶间的γ/γ′共晶组织周围偏析，热处理使Sn元素的偏析消失而均匀地分布在合金中。Sn的添加对DD26单晶合金的室温拉伸性能和975 ℃/255 MPa持久性能的影响较小。

关键词 ：金属材料, 镍基单晶高温合金, 液态金属冷却工艺, Sn元素, 组织, 力学性能

Abstract：

Four DD26 nickel-based single-crystal superalloys with varying Sn contents (mass fractions of 0%, 0.01%, 0.05%, and 0.10%) were prepared using liquid metal cooling (LMC) directional solidification process. The influence of Sn-amount on the microstructures, as well as the room-temperature tensile properties and stress rupture properties tested under 975 ^oC/255 MPa was investigated for the as-cast and heat-treated alloys. It was found that there was no significant change in primary dendrite arm spacing, γ/γ′ eutectic content, or the average size and volume fraction of the γ′ phase in DD26 single crystal superalloys with the increase of Sn content. No compounds involving Sn and Ni formed in as-cast alloy, and the Sn segregated around the γ/γ′ eutectic structures in the interdendritic regions. After heat treatment, the segregation of Sn disappeared and Sn distributed uniformly throughout the alloy. No measurable effect on either the tensile properties or the stress rupture performance of DD26 single crystal superalloys was observed with the addition of Sn.

Key words： metallic materials nickel-based single crystal superalloy liquid metal cooling processing Sn microstructure mechanical property

收稿日期: 2025-07-23

ZTFLH:

TG244.2

基金资助:国家重点研发计划(2021YFB3702900);中国科学院金属研究所创新基金(2024-PY04);辽宁省科学技术计划(2022JH2/101300226)

通讯作者: 申健，研究员，shenjian@imr.ac.cn，研究方向为单晶高温合金先进定向凝固技术；
张健，研究员，jianzhang@imr.ac.cn，研究方向为单晶叶片材料及先进制备技术

Corresponding author: SHEN Jian, Tel: 13804984964, E-mail: shenjain@imr.ac.cn;
ZHANG Jian, Tel: 13840053283, E-mail: jianzhang@imr.ac.cn

作者简介: 金师行，男，2002年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2025.237 或 https://www.cjmr.org/CN/Y2026/V40/I3/161

图1 不同Sn含量合金的差热分析曲线

表1 在降温过程中Sn含量对合金相变温度的影响

图2 不同Sn含量铸态合金的枝晶组织

图3 不同Sn含量铸态合金中的一次枝晶间距和共晶的体积分数

图4 不同Sn含量铸态合金中的枝晶干、枝晶间γ′相的形貌

图5 不同Sn含量铸态合金中的枝晶干和枝晶间γ′相的体积分数和平均尺寸

图6 0.10%Sn铸态合金中元素的分布

图7 图6中(a)区域放大后的元素分布

图8 Sn元素的聚集区域

表2 各区域中元素的占比

图9 Ni-Sn二元相图[27]

图10 0.10%Sn合金固溶热处理后元素的分布

图11 不同Sn含量合金的室温拉伸性能

图12 不同Sn含量合金的975 ℃/255 MPa持久性能

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