摘要
High-temperature Ni-based alloys are widely used in the aerospace field due to their excellent properties,but the shortcomings of brittle fracture at the grain boundaries and poor plasticity at room temperature also limit their development to a certain extent.Researchers found that there areγ′precipitation phases similar to Ni_(3)Al in Pt-Al based alloys.In this paper,the CASTEP code of Materials Studio software package is used to simulate the thermal and mechanical properties ofγ′-Pt_(3)Al phase andγ′-Ni_(3)Al phase.By comparing the performance characteristics of the electronic structure,mechanical properties and point defect structure of the two,it is found that the stability,elastic deformation resistance and high temperature creep resistance of theγ′-Pt_(3)Al phase are better than those of theγ′-Ni_(3)Al phase.This will provide theoretical guidance for promoting the development of Pt-Al-based high-temperature materials.
高温镍基合金由于其优异的性能而被广泛应用于航空航天领域,但其晶界脆性断裂和室温塑性差的缺点也在一定程度上限制了其发展。研究发现,在Pt-Al基合金中存在类似于Ni_(3)Al的γ'析出相。本文使用Materials Studio软件包的CASTEP代码来模拟γ'-Pt_(3)Al相和γ'-Ni_(3)Al相的热力学性能。通过比较两者的电子结构、力学性能和点缺陷结构的性能特征发现,γ'-Pt_(3)Al相的稳定性、抗弹性变形性能和高温蠕变性能均优于γ'-Pt_(3)Al相。这将为促进Pt-Al基高温材料的发展提供理论指导。
作者
ZHANG Xiao
ZHOU Xiao-long
YAO Bi-xia
YU Jie
WANG Li-hui
张晓;周晓龙;姚碧霞;于杰;王立惠(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200000,China;Guilin Key Laboratory of Microelectronic Electrode Materials and Biological Nanomaterials,Nonferrous Metal(Guilin)Geology and Mining Co.,Ltd.,Guilin 541004,China)
