Heterogeneity of dislocation substructure in polycrystalline metals and its influence on mechanical properties
| Project/Area Number |
17H06933
|
|---|
| Research Category |
Grant-in-Aid for Research Activity Start-up
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Physical properties of metals/Metal-base materials
|
|---|
| Research Institution | Kyushu University |
|---|
Principal Investigator |
|
|---|
| Research Collaborator |
Mitsuhara Masatoshi
Nakashima Hideharu
|
|---|
| Project Period (FY) |
2017-08-25 – 2019-03-31
|
| Project Status |
Completed (Fiscal Year 2018)
|
| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Keywords | 転位 / 電子顕微鏡 / 金属材料 / 塑性変形 / 転位組織 / 金属 / 強度 / 変形 / 金属物性 |
|---|
| Outline of Final Research Achievements |
Dislocation substructure development in pure nickel deformed by SEM in-situ tensile test was observed by SEM electron channeling contrast method. In pure nickel, an increase in slip lines and dislocation pileup near grain boundaries were observed. In the case of hexagonal titanium alloys, dislocations mainly active in prism slip and basal slip were observed in the grains. On the other hand, in the vicinity of grain boundaries, dislocation lines considered to be active on the pyramidal surface were frequently observed. It is understood that this is because, in the hexagonal titanium alloy having low crystal symmetry, the activity of pyramidal slip is activated in the vicinity of the grain boundary in order to maintain the continuity of displacement with adjacent grains.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究成果より、強化が施された実用合金ではSEM-ECCI法により材料中の転位組織の発達やその不均一性を観察できることが明らかとなった。転位組織の発達挙動を理解することは材料の力学特性を理解する上で非常に重要であり、本手法は実用合金の組織評価に関して極めて有用な方法である。
|
Report
(3 results)
Research Products
(4 results)
