定向能沉积 Fe36Ni35Al17Cr10Mo2 共晶高熵合金:分层微结构和拉伸性能

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Dingcong Cui , Zishu Chai , Kexuan Zhou , Meijuan Li , Dongfeng Chen , Jieguang Huang , Xindang He , Zhijun Wang , Feng He
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引用次数: 0

摘要

共晶高熵合金(EHEA)因其出色的性能而备受关注,通常采用传统制造方法制造。可制造近净部件的增材制造(AM)技术为 EHEA 的快速原型制造提供了机会。本研究通过 XRD、SEM 和 EBSD 阐明了通过定向能沉积(DED)制造的 Fe36Ni35Al17Cr10Mo2 EHEA 的微观结构演变机制。双相枝晶结构、微尺度异质晶粒和纳米尺度 BCC 相共同形成了定向能沉积合金的分层微观结构。我们利用中子衍射来展示纹理成分及其与力学行为的关系。与其他纹理相比,{013}<100>纹理具有最高的施密特因子,在拉伸过程中会导致 FCC 和 B2 相因纹理而软化。{233}<0⑴‾1>纹理表现出较低的 SF 值和 B2 相的硬取向。由于 FCC 相和 B2 相之间的协同塑性变形以及 BCC 相的沉淀强化,DEDed Fe36Ni35Al17Cr10Mo2 在室温下的极限强度为 1267 MPa,伸长率为 20.1%。此外,还采用了高温拉伸试验和裂纹分析来显示高温断裂行为。我们发现,在高温下,相界处的微裂纹成核和扩展受到抑制,从而避免了脆性,实现了优异的高温力学性能。这些结果有望为增材制造无钴高性能 EHEA 开辟更加广阔的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Directed energy deposited Fe36Ni35Al17Cr10Mo2 eutectic high entropy alloy: Hierarchical microstructure and tensile properties
Eutectic high entropy alloy (EHEA) has attracted much attention due to its outstanding properties, which are commonly fabricated through conventional manufacturing methods. Additive manufacturing (AM) techniques that can create near-net components provide opportunities for rapid prototyping EHEAs. This study elucidated the microstructural evolution mechanisms of Fe36Ni35Al17Cr10Mo2 EHEA fabricated by directed energy deposition (DED) via XRD, SEM, and EBSD. The dual-phase dendrite structure, micro-scale heterogeneous grains, and nano-scale BCC phases collectively formed the hierarchical microstructure in the DEDed alloy. We used neutron diffraction to demonstrate texture components and their relation to mechanical behaviors. {013}<100> texture possesses the highest Schmid factor compared to other textures, causing texture-induced softening of the FCC and B2 phases during tension. {233}<0 1 1> texture exhibits the low SF and hard orientation for the B2 phase. Due to the synergistic plastic deformation between FCC and B2 phases and precipitation strengthening from the BCC phases, the DEDed Fe36Ni35Al17Cr10Mo2 exhibits an ultimate strength of ∼1267 MPa with an elongation of ∼20.1 % at room temperature. Moreover, the elevated-temperature tensile testing and crack analysis were employed to indicate the elevated-temperature fracture behaviors. We found that the nucleation and propagation of microcracks were suppressed at the phase boundary at elevated temperatures, avoiding brittleness and achieving excellent high-temperature mechanical properties. These results are expected to open ever-bright prospects for additive manufacturing Co-free high-performance EHEAs.
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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