| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2012: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
|
|---|
| Outline of Final Research Achievements |
Mechanisms of ultrafine grain evolution and strengthening of Mg alloys processed by room-temperature multi-directional forging (MDFing) were revealed. Thermo-mechanical processes to obtain ultra-high strength Mg alloys with good formability were established. Actually, the world highest strength of 650 MPa UTS without spoiling ductility was achieved. Even while the same process was applied to a large bulky Mg alloy, the tensile strength was saturated around 500 MPa. The relatively lower strength in the large samples was assumed due to inhomogeneous microstructure and larger amount of distribution of defects.
When compared the strength of Mg alloys fabricated by room-temperature MDFing and MDFing at elevated temperatures, they showed different mechanical properties, e.g., the former exhibit higher strength but the latter larger ductility.
|
