Investigation on Feathery Crystals Developed in Weld Metal of Aluminum Alloy Using SAM and TEM.
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- Katoh Mitsuaki
- Kyushu Institute of Technology
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- Nishio Kazumasa
- Kyushu Institute of Technology
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- Yamaguchi Tomiko
- Kyushu Institute of Technology
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- Nokami Toshinobu
- Kyushu Institute of Technology
Bibliographic Information
- Other Title
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- SAM及びTEMによるアルミニウム合金の溶接金属中に形成される羽毛状晶の検討
- SAM オヨビ TEM ニヨル アルミニウム ゴウキン ノ ヨウセツ キンゾク
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Abstract
Macrostructures which are usually developed near the center of weld metal of aluminum alloys are columnar crystals and equiaxed dendrites. The development of the macrostructures depends on the welding conditions. A feathery crystal is sometimes developed when welded by GTA in a low welding speed. In this study, we investigate characteristics of the feathery crystal using both a scanning acoustic microscope (SAM) and a transmission electron microscope (TEM). It is possible to observe structures without etching by SAM. By observing normal and parallel section to the welding direction, we made clear the growth feature of the feathery crystal. When we measure the velocity of elastic surface wave of the feathery crystal using SAM with an anisotropic acoustic lens, the velocity is about 100 m/s faster in parallel to the welding direction than in normal direction. That is, the feathery crystal is acoustically anisotropic. We could observe the feathery crystal even in electron beam welds using SAM. It is not generally easy to observe macrostructure of electron beam welds, because the bead width is narrow. Moreover, we confirm that the feathery crystal is a twin by analyzing electron diffraction patterns obtained using TEM.
Journal
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- QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
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QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 14 (4), 698-702, 1996
JAPAN WELDING SOCIETY
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Keywords
Details 詳細情報について
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- CRID
- 1390282679698589312
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- NII Article ID
- 130003934450
- 110003423549
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- NII Book ID
- AN1005067X
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- ISSN
- 24348252
- 02884771
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- NDL BIB ID
- 4087960
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed