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Mechanical properties of tungsten fiber reinforced-Ti-6Al-4V alloy MMCs
Sunyoung SON,Shin-ichi NISHIDA,Nobusuke HATTORI,Young-Suk KIM 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.8
The objective of this study is to establish an optimized manufacturing process of the metal-matrix composite (MMC) made from tungsten fiber reinforced Ti-6Al-4V alloys using a hot isostatic pressing (HIP). The rod type MMC was made by mixing W fibers of W fibers of 20 ㎛ in diameter and 1㎜ long and Ti-6Al-4V powders of of 70 ㎛ in the mean diameter in a V-mill blender, pressing the mixed powders using in argon atmosphere at 950℃ for 1 hr. under applied pressure of 1000㎫, followed by swaging at RT with 70% cold work. The MMC with the tungsten fibers varying from 0 to 12 vol.% were subjected to tensile tests, fatigue tests and hardness measurement ar RT. Comparing to the mechanical properties of conventional Ti-6Al-4V alloy, the rod-type MMC made by HIP had increased hardness with increasing volume percent of W fibers, the peak tensile strength at the 9vol.% W fibers but lower fatigue strengths for all the volume percent of W fibers added. The effect of the W fiber concentration on the mechanical properties of the MMCs was discussed based on the orientation of the W fibers in the matrix, porosity and the secondary cracks which were evaluated by microstructural examination of the MMCs after mechanical tests.
손선영(Sunyoung SON),Shin-ichi NISHIDA,이종형(Jong-hyung LEE),김영태(Young-tae KIM),이도경(Do-kyung LEE),손용제(Yong-jea SON),장현덕(Hyun-duck Jang) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.4
새로운 티타늄기 MMCs(W/ Ti-6Al-4V)에 대한 기계적 특성에 대한 연구를 행하여 평가한 결과를 나타내었다. HIP(hot isostatic pressing) 제조법과 RS(Rotary Swaging) 2 차 가공을 통하여 텅스텐 섬유 함유율이 각각 6, 9, 12 vol%인 W/Ti-6Al-4V MMCs 를 제작하였으며, 경도는 기존의 Ti-6Al-4V 합금과 비교하여 20-30%, 인장강도는 50%(비강도-38%) 높은 값을 얻었다. 섬유 함유율 9vol.% 에서 가장 높은 인장 값을 나타내었으며, MMCs 에서 메트릭스와 계면 사이에 생성된 확산상에 의해서 경도 및 인장강도가 향상되었다. 또한 피로 강도를 향상 시키기 위한 방법으로 메트릭스의 질적 향상을 위한 HIP 제작조건에 대한 추가적인 연구가 필요하다. The objective of this study is the estimation of the mechanical properties of HIP-treated MMCs by an optimized manufacturing process. The Ti-MMCs were fabricated by HIP and rotary swaging (RS) for secondary processing. The Ti-MMCs with different tungsten fiber contents of 0, 6, 9, and 12 vol% were subjected to tensile tests, fatigue tests, and hardness tests. The results show that the hardness values of Ti-MMCs increased with the increasing volume percent of tungsten fibers, the tensile strength increased by approximately 50% (specific strength: 38%) at the 9 vol%. The value of tungsten-fiber orientation F affects the tensile strength. The fatigue strengths of the Ti-MMCs did not improve. HIP is a useful manufacturing method for Ti-MMCs and RS is an important process for improving fiber orientation during secondary processing.