Microstructural evolution and phase transformation of Ni3Al-based superalloys after thermal exposure
作者： Yefan Li , Chong Li , Yuting Wu , Jing Wu , Zongqing Ma
DOI: 10.1016/J.VACUUM.2019.109038
关键词: Thermal 、 Envelope (waves) 、 Alloy 、 Martensite 、 Casting 、 Composite material 、 Superalloy 、 Ostwald ripening 、 Phase (matter) 、 Materials science
摘要: Abstract The microstructural evolution and phase transformation behavior of a designed multiphase Ni3Al-based superalloy in as-cast spray casting states were investigated under thermal exposure at various temperatures. For the temperatures range from 600 °C to 900 °C, average size γ′ precipitates dendritic dual (γ+γ′) areas two alloys increases, morphology changes irregular shapes due merging neighboring particles Ostwald ripening. After or bulky generate interdendritic regions alloy, envelope develops curved interface by aggregation. sample, high density microtwins are ‘inherited’ preceding L10-type martensite phases after 600 °C. However, without any form 900 °C.
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