Microstructural Feature and Evolution of Rapidly Solidified Ni3Al-Based Superalloys

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2019,（6）
• 页码范围: 764-770
• 页数: 7页
• 语种: 英文

摘要

The Ni3Al-based superalloy was rapidly solidified in the form of droplets with varying diameters.The cooling rate (Re) is a function of diameter (D) of droplet.With the decrease in droplet sizes (increase in the cooling rates),the volume fraction of γ' + γ eutectic structure increases from 21.31 (D =1400 μm,Rc =3.6 × 102 K s-1) to 36.31％ (D =270 μm,Re=2.3 × 103 K s-1).Moreover,unimodal size distribution of nano-γ' exists in the droplets instead of bimodal dual-size distributions of γ' precipitates that are normal in as-cast alloys.