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TiNi/A16061 형상기억복합재료의 미세조직 및 피로특성에 관한 연구
윤두표,박영철,김순국,이준희,이규창,Yun, Du-Pyo,Park, Yeong-Cheol,Kim, Sun-Guk,Lee, Jun-Hui,Lee, Gyu-Chang 한국재료학회 1998 한국재료학회지 Vol.8 No.11
본 연구는 형상기억합금을 이용하여 제조한 신소재 중의 하나인 형상기억복합재료를 소개하고자 한다. 이 복합재료는 TiNi 섬유의 형상기억효과로 금속복합재료의 취약점이라 할 수 있는 기지와 섬유간의 열팽창차이로 인한 인장잔류응력을 제거하고 기지내에 압축잔류응력을 발생시켜 높은 인장강도를 갖는다. 따라서 본 연구에서는 용탕단조법으로 복합재료를 제조한 후 미세조직을 관찰하고 TiNi 섬유의 역변태온도 이상에서 피로실험을 수행하여 복합재료의 피로특성을 검토하였다. 이 결과 363K에서의 피로균열전파제어효과는 섬유체적률과 예변형에 의하여 증가된다. In this study TiNi/A16061 shape memory composite is introduced as one of new material using a shape memory alloy. High tensile strength of composite due to compressive residual stress in matrix by the shape memory effect of TiNi fiber can be produced. This composite can remove the tensile residual stress by the difference of coefficients of thermal expansion between fiber and matrix. one of the significant weak point of metal matrix composite. In this paper, shape memory composites are made by squeeze casting. And then, microstructure and fatigue properties of the composites by shape memory effect above inverse transformation temperature A, of TiNi alloy are discussed. The results of the fatigue crack control properties of TiNi/A16061 shape memory composite by a squeeze casting are summarized as follows the effect of fatigue crack propagation control at 363K increases according to the increase of volume fraction and prestrain in composites.
초음파를 이용한 비파괴방법에 의한 SiC/AC8A 금속 복합재료의 미시조직 평가
이규창,박영철,윤두표 韓國非破壞檢査學會 1996 한국비파괴검사학회지 Vol.16 No.4
초음파법을 이용한 금속 복합재료의 비파괴 평가 방법을 확립하기 위하여 용탕단조법으로서 SiC/AC8A 합금계 금속 복합재료를 제조하였다. 이때 입자의 크기가 기계적 특성과 초음파 특성에 미치는 영향을 검토하기 위하여 강화 입자의 크기를 4.86, 8.09, 11.44㎛로 서로 다른 세 종류로 달리하였으며, 또한 강화입자 함유량이 초음파 특성에 미치는 영향을 검토하기 위하여 각 강화 입자의 크기에 대하여 강화 입자 함유율을 14, 22.5, 27.5, 35%의 네 종류로 시료를 준비하였다. 이와 같은 시료에 대하여 기계적 성질중에서 가장 기본이 되는 탄성계수에 대하여 초음파 음속법을 이용하여 그 유효성 및 측정 정도에 대하여 검토를 하였으며 초음파 음속, 감쇠 특성을 이용한 금속 복합재료의 미세조직 평가 방법에 대하여서도 검토하였다. 그 결과, 초음파 음속법에 의한 탄성계수 측정은 기계적 시험에 의한 변형률 측정법과 같은 측정 정도를 나타낼 수 있을 정도로 유효할 뿐만 아니라 초음파 음속, 감쇠 특성을 이용하면 금속 복합재료의 조직 인자중 특히 강화 섬유의 크기 및 함유율을 비파괴적으로 정도 높게 평가할 수 있다는 것을 알았다. This study is performed to establish a non-destructive evaluation method for metal matrix composite using ultrasonic technique. The specimen si made of SiC/AC8A metal matrix composite by squeeze-casting method. Three kinds of reinforced particles are prepared as 4.86, 8.09 and 11.44 ㎛ to investigate the effect of size on the mechanical and ultrasonic properties of metal matrix composite. In addition, four different volume fractions(14, 22.5, 27.5, 35%)of reinforced particles are prepared per each size to examine the effect of volume fraction on the ultrasonic properties. From this specimen, the availability and precision of measurement of Young's modulus are examined and the evaluation method for microstructure of metar matrix composite using the speed of sound and attenuation factor is also reviewed. The results show that the Young's modulus measured by ultrasonic method is as effective as that measured by mechanical method. It si also known that the size and volume fraction of reinforced fiber are precisely evaluated using the speed of sound and attenuation factor.
TiNi 섬유가 강화된 형상기억복합재료에 있어서의 응력해석
윤두표,김광영,박영철 東亞大學校 大學院 1998 大學院論文集 Vol.23 No.-
The shape momery alloy material is producted by the powder metallugy with TiNi alloy, before its mechanic properties are resulted by the stress analysis. Because the result of the stress analysis and that of the tensile test is similar, we would properly design the volume fracton and the strength of the shape memory alloy material.
분말야금법을 이용한 TiNi기 형상기억 복합재료의 기계적특성에 관한 연구
박영철,윤두표,박민식,김광영 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
In this study, It is introduced that TiNi/Al-radical shape memory composite as one of new material that used shape memory alloy (SMA). It is a method to produce a better strength of composite by occuring compressive residual stress in matrix, using shape memory effect of TiNi fiber. This method os replaced of tensile residual stress happened by difference of coeffients of thermal expansion (CTE) between fiber and matrix, one of the significant faults of metal matrix composite (MMC). In this paper, shape memory composites are made by powder metallurgy. And then, an self-strengthening effect of the composites by shape memory effect above inverse transformation temperature A_f of TiNi alloy are discussed. Moreover, TiNiCo/Al composites is made by using TiNiCo alloy as fiber. And it is discussed about affection of Co in the shape memory composite. The results of the intelligent properties of TiNi/Al-radical shape memory composite, using SMA, by powder metallurgy are the tensile strength of TiNiCo wire is much higher than that of TiNi wire and the strength of TiNiCo/Al composite is generally higher than of TiNi/Al composite.
TiNi 가 섬유가 TiNi (Co)/Al 형상기억복합재료의 피로균열전파에 미치는 영향
박영철,윤두표,김순국,이준희,이규창 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.5
In this paper, TiNiCo/Al shape memory composites were fabricated by powder metallurgy method. TiNi and TiNiCo were used as fiber for reinforcement. To investigate the fatigue crack propagation behavior due to the compressive residual stress which exists in the composites, fatigue test was performed at room temperature and above the inverse transformation temperature A_f of TiNi and TiNiCo shape memory alloy. Results are as follows; At 363 K, both composites have lower fatigue crack propagation rate than pure matrix in the same ΔK area and the fatigue crack propagation of TiNi/Al composite is lower than that of TiNiCo/Al composite.
TiNi/Al 형상기억 지적복합재료의 기계적 특성 및 강화기구
박영철,윤두표,이규창,Park, Yeong-Cheol,Yun, Du-Pyo,Lee, Gyu-Chang,Huruya, Y. 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
In the present paper, it is attempted to reconfirm the "Intelligent" material properties using both the sintered TiNi/Al(1100) matrix composite made by powder metallurgy method and the squeeze-casted TiNi/Al6061 specimens. A metal matrix composite is, its fault has been considered to deteriorate a strength of composite by heating residual stress of the matrix. Therefore, it is necessary to remove a tensile residual stress, to produce the strength of a composite better. On the contrary, if compressive residual stress happens in matrix of composite in place of tensile residual stress, it will make the strength of composite better. So that, this paper introduce the development of a high strength of composite, by using compressive residual stress well, on the study. By using these specimens, shape memory strengthening effects in tensile strength and fatigue crack propagation above inverse transformation temperature of TiNi fiber were investigated. We occurs the prestrain and volume fraction for to discuss the effects of a composite strength. Moreover, by SEM observation, the effect of the residual stress at the interface between Al matrix and TiNi fiber and some brittle precipitation layers such as inter metallic compounds on fracture mechanisms was discussed metallurgically.urgically.