Design of Novel Precipitate-Strengthened Al-Co-Cr-Fe-Nb-Ni High-Entropy Superalloys

被引：69
作者：
Antonov, Stoichko [1 ]
Detrois, Martin [2 ]
Tin, Sammy [1 ]
机构：
[1] IIT, 10 W,32nd St, Chicago, IL 60616 USA
[2] Natl Energy Technol Lab, ORISE, 1450 Queen Ave SW, Albany, OR 97321 USA
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 01期
关键词：
PHASE-STABILITY; ALLOYS; MICROSTRUCTURE; BEHAVIOR; AL8CO17CR17CU8FE17NI33; DIFFUSION; ELEMENTS; IMAGE;
D O I：
10.1007/s11661-017-4399-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A series of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys, with varying levels of Co, Nb and Fe, were investigated in an effort to obtain microstructures similar to conventional Ni-based superalloys. Elevated levels of Co were observed to significantly decrease the solvus temperature of the gamma' precipitates. Both Nb and Co in excessive concentrations promoted the formation of Laves and NiAl phases that formed either during solidification and remained undissolved during homogenization or upon high-temperature aging. Lowering the content of Nb, Co, or Fe prevented the formation of the eutectic type Laves. In addition, lowering the Co content resulted in a higher number density and volume fraction of the gamma' precipitates, while increasing the Fe content led to the destabilization of the gamma' precipitates. Various aging treatments were performed which led to different size distributions of the strengthening phase. Results from the microstructural characterization and hardness property assessments of these high-entropy alloys were compared to a commercial, high-strength Ni-based superalloy RR1000. Potentially, precipitation-strengthened high-entropy alloys could find applications replacing Ni-based superalloys as structural materials in power generation applications.
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收藏
页码：305 / 320
页数：16
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