基于同步辐射<strong>X</strong>射线成像液<strong>/</strong>固复层界面氢气泡的形核、生长演变与运动行为的原位研究

doi:10.11900/0412.1961.2022.00062

金属学报

2022, Vol. 58

Issue (4): 567-580 DOI: 10.11900/0412.1961.2022.00062

研究论文

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基于同步辐射X射线成像液/固复层界面氢气泡的形核、生长演变与运动行为的原位研究

丁宗业, 胡侨丹(

), 卢温泉, 李建国

上海交通大学材料科学与工程学院上海 200240

In Situ Study on the Nucleation, Growth Evolution, and Motion Behavior of Hydrogen Bubbles at the Liquid/ Solid Bimetal Interface by Using Synchrotron Radiation X-Ray Imaging Technology

DING Zongye, HU Qiaodan(

), LU Wenquan, LI Jianguo

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

引用本文:

丁宗业, 胡侨丹, 卢温泉, 李建国. 基于同步辐射X射线成像液/固复层界面氢气泡的形核、生长演变与运动行为的原位研究[J]. 金属学报, 2022, 58(4): 567-580.
Zongye DING, Qiaodan HU, Wenquan LU, Jianguo LI. In Situ Study on the Nucleation, Growth Evolution, and Motion Behavior of Hydrogen Bubbles at the Liquid/ Solid Bimetal Interface by Using Synchrotron Radiation X-Ray Imaging Technology[J]. Acta Metall Sin, 2022, 58(4): 567-580.

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摘要:

利用同步辐射X射线二维成像技术对液/固复层界面加热过程中氢气泡的生长、运动行为及形态演变进行了原位表征，研究气泡的形核机理、生长机制与运动特征。结果表明，氢气泡的形核机制主要为非均质形核与双层表面膜演变；成分不均匀与双层膜转变将群体气泡的生长分为2个不同阶段，气泡平均尺寸与时间的变化关系遵循stochastic 随机模型；其生长机制为跳跃合并与熟化吞并机制，伴随着氢气泡形态由球状向椭球状与非规则状转变；氢气泡的运动包含向上迁移与无定向跳跃，在金属间化合物阻碍下氢气泡的生长经历多次跳跃，主要归因于双层表面膜转变为气泡、变形气泡尺寸增加、化合物溶解与化合物的扰动。

关键词 ：液/固界面, 非平衡凝固, 氢气泡, 同步辐射, 金属间化合物

Abstract：

Pore defects at the liquid/solid interface contribute to the interfacial bonding quality. Understanding the formation and growth mechanism of pores can help control their size distribution and eliminate their formation. However, the traditional static-research methods limit the in-depth study of the dynamic evolution behavior of bubbles. The growth, motion behavior, and morphological evolution of hydrogen bubbles at the liquid/solid bimetal interface during heating were characterized in situ, using synchrotron radiation X-ray imaging technology, and the bubbles' nucleation, growth mechanisms, and motion characteristics were investigated. The results show that the nucleation mechanism of hydrogen bubbles contains heterogeneous nucleation and bifilms. Bubble growth is divided into two stages: the inhomogeneous composition and bifilm transformation into hydrogen bubbles. The relationship between the bubbles' mean diameter and heating time conform to the stochastic model. The growth mechanism of bubbles exhibits jump merging and annexation behaviors, accompanied by the morphological transformation from spherical to elliptic and irregular shapes. The motion of the hydrogen bubbles includes upward migration and astatic jumping. The bubbles' growth, hindered by intermetallic compounds (IMCs), has experienced several jumps, attributed to the transformation of bifilms into bubbles, increasing bubble size and deformation, IMC dissolution, and IMC disturbance.

Key words： liquid/solid interface non-equilibrium solidification hydrogen bubble synchrotron radiation intermetallic compounds

收稿日期: 2022-02-17

ZTFLH:

TG245

基金资助:国家自然科学基金项目(51922068);国家自然科学基金项目(51727802);国家自然科学基金项目(51904187);中国博士后科学基金项目(2019M661500)

作者简介: 丁宗业，男，1987年生，博士

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图1 Al/Ni液/固界面加热过程中不同阶段氢气泡的实时演变行为

图2 Al/Ni液/固界面加热过程中非均匀熔体不同区域氢气泡的实时生长放大图

图3 氢气泡数量随时间的变化，群体气泡平均尺寸随时间的变化，阶段1及阶段2不同区域气泡的平均尺寸变化

图4 加热过程中单个气泡生长示意图

图5 Al/Ni液/固界面加热过程中Al3Ni金属间化合物溶解与氢气泡生长的实时成像

图6 化合物阻碍下氢气泡数量随时间的变化，群体气泡平均尺寸随时间的变化，及单个气泡的平均尺寸随时间的变化关系

图7 液/固界面加热过程中双层膜演变、Al3Ni化合物阻碍下氢气泡的生长与跳跃行为的实时成像

图8 双层表面膜演变、氢气泡的生长与跳跃的实时成像

图9 熔体/金属间化合物过渡区氢气泡的生长演变与跳跃的实时成像

图10 Al/Ni液/固界面中Al枝晶和金属间化合物为凹槽衬底的氢气泡异质形核示意图

图11 Al/Ni液/固界面第一阶段变形氢气泡迁移合并的实时成像，第二阶段静止吞并行为的实时成像和示意图，及Al/Ni液/固界面氢气泡的合并行为的实时成像

图12 氢气泡尺寸增加发生跳跃行为和化合物溶解导致氢气泡发生跳跃行为的示意图

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