[T14] High Temperature Materials

[15F-T14-04] Influence of Heat Treatment Temperature on the Structure and Mechanical Properties of Modified MA6000 Alloy Fabricated by Spark Plasma Sintering

*C. V. Dinh¹, D.-W. Lee¹, S.-G. Lee¹, J.-W. Kim³, J.-C. Kim¹, H.-J. Kim², J.-G. Lim³, T.-S. Yoon³ (1.University of Ulsan, Korea, 2.Korea Institute of Industrial Technology, Korea, 3.DaiShinKangup Co., Ltd., Korea)

キーワード：Modified MA6000 alloy, high-strength nickel-based alloy, spark plasma sintering

MA6000 alloy is a high-strength nickel-based alloy renowned for its exceptional mechanical properties. It has been widely used in the aerospace and defense industries. This study aims to characterize the modified MA6000 alloy by analyzing the effects of post-heat treatment temperatures on its structure and mechanical properties. The MA6000 alloy, with a modified composition (64% Ni, 17% Cr, 3% Al, 4% W, 3% Ti…) was fabricated through the spark plasma sintering at 1000°C and 50 MPa pressure. Subsequently, the samples underwent annealing within the temperature range of 1000–1400 °C for 4 hours. Structural analyses were performed utilizing various techniques such as optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). Mechanical properties of the as-fabricated and heat-treated samples were examined through nano-indentation, micro-indentation, and compression tests. This investigation will show the thermal processing effects of the modified MA6000 alloy, providing optimizing conditions for its engineering properties.