Three dimensional surface by using nano-scale stress field induced by addition of elements

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630007
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Yokohama National University
• Principal Investigator: Shibutani Tadahiro 横浜国立大学, リスク共生社会創造センター, 准教授 (10332644)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 薄膜 / 微小欠陥 / ナノ材料強度

Outline of Final Research Achievements

At first, the focus of this study is put on defects on pure tin and tin-copper surface finish. The behavior of defects induced by residual stresses are observed by atomic force microscopy.Residual stresses are developed by spring back effect. The digital image correlation method indicates that the severe strain gradient area is related to the surface defects. The qualitative evaluation of volume grow rate can be evaluated by using difference in images.
Another sample is tin with addition of Ru. Microwave heating method was used. Defects are observed on the oxided area of surface. This behavior is defferent from general mechanism of tin whisker growth.

Free Research Field

材料力学、薄膜工学