| Project/Area Number |
17K06829
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Composite materials/Surface and interface engineering
|
|---|
| Research Institution | Kagoshima National College of Technology |
|---|
Principal Investigator |
Higashi Yuichi 鹿児島工業高等専門学校, 機械工学科, 准教授 (70709336)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
岩本 知広 茨城大学, 理工学研究科(工学野), 教授 (60311635)
|
|---|
| Project Period (FY) |
2017-04-01 – 2020-03-31
|
| Project Status |
Completed (Fiscal Year 2019)
|
| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
|
|---|
| Keywords | 超音波接合 / Mg合金 / LPSO相 |
|---|
| Outline of Final Research Achievements |
In this study, when the dent depth in the ultrasonic welded joints become excessive, the effect on the microstructure evolution during the welding process was evaluated. A flame-retardant LPSO type Mg alloy which Zn and Y were added was used for the specimens. The alloys have the LPSO phases enriched in Zn and Y extending along the extrusion direction. After the welding, when the dent depth became deeper, the continuity of the LPSO phases was lost, and it changed into a mottled morphology. A more detailed observation in the mottled LPSO phases revealed that it consisted of plate-like LPSO phases. Furthermore, it was also clarified that the molten structure was locally formed along the welded interface at the deepest dent depth.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究から得られた研究成果は，超音波接合プロセス中で生じる継手の凹みの進行についてマクロ的な塑性変形の過程を微細組織観察の観点から評価したものである．超音波接合の接合機構においては，接合中の熱の影響や塑性変形挙動が重要な要素として挙げられる．２相合金における方向性の強い合金において，微細組織の進展がマクロ的な塑性変形挙動と関連付けられ，微細組織の特徴から明らかになった諸現象が超音波接合機構の理解に貢献できるものと考えられる．
|
