| 학회 | 한국재료학회 |
| 학술대회 | 2012년 가을 (11/07 ~ 11/09, 라카이샌드파인 리조트) |
| 권호 | 18권 2호 |
| 발표분야 | E. 구조 재료(Structural Materials) |
| 제목 | Effect of crystalline phases on the microstructure and mechanical properties in Zr-based bulk metallic glasses |
| 초록 | Improvement of yield strength and enhancement of plasticity have been probed into partially substituting Zr with M in Zr-Cu-Al-Ni-M (M = Nb, Mo, Fe) alloys. As Nb has a positive heat of mixing enthalpy with Zr (+17 kJ/mol) in the liquid state and high melting temperature, the alloy composition has exhibited chemical heterogeneity and high viscosity, glass transition temperature and crystallization temperature. Then, to form crystalline phases of nano-scale during cooling from the liquid state has influence to develop plasticity. Although the compositional range is limited, the results demonstrate that additional element has a positive heat of mixing enthalpy with constitutive element in bulk metallic glassescan improve the mechanical and thermal properties.And, both Mo and Fe have negative heat of mixing enthalpies with Zr (Zr-Mo : -25 kJ/mol, Zr-Fe : -118 kJ/mol) in the liquid state. Though Fe has lower melting temperature than Nb and Mo, the alloy composition have showed low viscosity and homogeneous microstructures and enhanced glass forming ability. A series of Zr65-xCu17.5Al7.5Ni10Mx alloys was prepared by arc melting suction casting facility. Thermal properties of the samples were measured by differential scanning calorimetry (DSC). The microstructural identification was done using X-ray diffraction with Cu Kα1 radiation (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM).The mechanical properties of the samples were measured at room temperature under compressive mode using Universal Testing Machine(UTM). We will discuss the influence of Maddition on microstructure and mechanical properties of Zr65Cu17.5Al7.5Ni10 BMG in detail. |
| 저자 | Soohyun Im1, Jeongtae Kim2, Jinyoo Suh3, Eric Fleury4, Kibuem Kim5 |
| 소속 | 1Faculty of Nanotechnology and Advanced Materials Engineering, 2Sejong Univ., 3Gunja-dong, 4Gwangjin-gu, 5Seoul 143-747 |
| 키워드 | metallic glass; mechanical properties; plasticity |
