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Vol.44, No.10, 684 ~ 691, 2006
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| Title |
| Damping Capacity and Fracture Toughness of Over-aged Ti-6Al-4V Biomaterials |
| 이동근 Dong Geun Lee , 이성학 Sung Hak Lee , 이용태 Yong Tai Lee , 염종택 Jong Taek Yeom , 김정한 Jeoung Han Kim , 박노광 Nho Kwang Park |
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| Abstract |
| The present study was concerned with the effects of over-aging on damping property and fracture toughness in Ti-6Al-4V alloy for biomaterials. Damping property and toughness become important factors for titanium implants, which have big modulus difference between bone and implant, and need high damping capacity for bone-implant compatability. Widmanstatten, equiaxed, and bimodal microstructures containing fine α2 particles were obtained by over-aging a Ti-6Al-4V alloy. Over-aging heat treatment was conducted for 200 hrs at 545℃. Fracture toughness, Charpy impact and bending vibration tests were conducted on the unaged and the over-aged six microstructures, respectively. Charpy absorption energy and apparent fracture toughness decreased as over-aging was done, even if the materials were strengthened by precipitation of very fine and strong α2-Ti3Al particles. On the other hand, damping properties were enhanced by over-aging in Widmanstatten and equiaxed microstructures, but was weakened in bimodal microstructure due to the softening of tempered martensite and the decreasing of elastic difference between tempered martensite and α phase contained α2 particles, etc. These data can provide effective information to future work about internal damping and fracture properties of Ti-6Al-4V biomaterials. |
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| Key Words |
| Ti-6Al-4V alloy, α2-Ti3Al precipitates, Widmanstatten, equiaxed, Bimodal, damping capacity, impulse-frequency response method, fracture toughness |
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