异质相界面对低熔点金属晶须自发生长的影响机制研究

项目名称： 异质相界面对低熔点金属晶须自发生长的影响机制研究

项目编号： No.51501038

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 张培根

作者单位： 东南大学

项目金额： 20万元

中文摘要： 金属晶须自发生长问题长期困扰着电子、电力、通讯等众多工程领域，虽经过近70年的研究，提出过很多理论、生长模型，但都有明显的局限性。申请人在前期研究中发现，“金属-异质相”复合体系中，金属晶须的自发生长现象显示了以往的研究中不能发现的很多生长特征。本研究以A-MAX、金属-金属间化合物等“金属-异质相”复合体系为研究对象，以晶须的形核机制与生长动力为研究目标。设计几种典型的金属-异质相界面，利用Micro-CT、SEM、EDS、TEM、FIB、DSC等技术手段，观察并分析晶须的形核位点特征、金属原子的扩散路径、晶须生长规律以及几何特征等。解决异质界面的晶体学特征与金属晶须形核的关系，以及金属晶须生长过程中原子的扩散机制及其驱动力等关键科学问题；从而阐明异质相界面对晶须生长的影响机制，并揭示金属晶须自发生长的普遍规律与物理本质。研究成果将有助于解决工程界的金属晶须问题。

中文关键词： 金属晶须；自发生长；异质相界面；生长机制

英文摘要： The spontaneous growth of metal whiskers has been perplexing many industrial sectors, such as electronics, electricity, communication engineering. The mechanism behind the whiskering phenomenon has been elusive, although efforts have been cast to this issue for nearly 70 years. Some different growth behaviors were observed by the applicant in the preliminary study, which provide new clues to seek the physics behind this phenomenon. In this proposal, a new family of samples of “metal-heterogeneous phase” composite system, including A-MAX, metal-intermetallic, etc., will be focused to study the nucleation mechanism and the driving force for the whisker growth. A series of “metal-heterogeneous phase” samples will be designed, and under the assistance of experimental techniques, such as Micro-CT, SEM, EDS, TEM, FIB sampling and DSC, the nucleating sites, atom diffusion path, growth behaviors and the geometry characteristics of the whiskers will be depicted. The effect of the crystal parameters of the metal-heterogeneous phase interface on the nucleation of metal whiskers and the driving force for the whisker growth will be analyzed. Finally, mechanisms of the whisker growth in the “metal-heterogeneous phase” systems will be established, which may open a new window to address the more general metal whisker growth phenomenon. The study is expected to give a solid support for the solution-seeking work aiming to address the whiskering issue in engineering.

英文关键词： metal whisker;spontaneous growth ;heterogeneous interface;growth mechanism