| Budget Amount *help |
¥40,040,000 (Direct Cost: ¥30,800,000、Indirect Cost: ¥9,240,000)
Fiscal Year 2016: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2015: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Fiscal Year 2014: ¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
|
|---|
| Outline of Final Research Achievements |
This study aims at clarifying the bonding mechanism of dissimilar metals at low temperatures and designing a new joining process of dissimilar metals that enables multi-material structures. For the purpose, steel-to-steel and steel-to-nickel combinations were warm-compressed and isothermally held, and the microstructure of the bonding interface and its strength were investigated. It was found that the evolution of the interfacial strength consisted of two stages; strength increase without increase in contact area of the interface (stage I) and the following strength increase with increasing the contact area (stage II). Analysis of strain distribution at the bonding interface and molecular dynamic simulation of the bonding process reveals that the rearrangement of atoms and decrease in compressed strain proceed in the stage I, which increases the interfacial strength without increase in contact area. The importance of isothermal holding after the compressive bonding is indicated.
|
