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首页> 外文期刊>Science and Technology of Advanced Materials >Microstructures and mechanical properties of bulk nanocrystalline Fe-Al-C alloys made by mechanically alloying with subsequent spark plasma sintering
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Microstructures and mechanical properties of bulk nanocrystalline Fe-Al-C alloys made by mechanically alloying with subsequent spark plasma sintering

机译：机械合金化并随后进行火花等离子烧结制成的块状纳米晶Fe-Al-C合金的显微组织和力学性能

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摘要

The microstructure and superior mechanical properties of bulk nanocrystalline Fe-Al-C alloys made by mechanically alloying (MA) with subsequent spark plasma sintering (SPS) were investigated. Three kinds of nanocrystalline Fe-24 at% Al-X at%C (X = 1,2,4) alloy powder were produced by MA from iron and aluminum powder with addition of methanol, and were subsequently consolidated at 1073-1273 K under 64 MPa by SPS. These compacts have the relative densities of 99.97% (1 at%C) to 99.5% (4 at%C). The structure of compacts with 1at%C is composed of grains of Fe_3Al of 1.5 μm in diameter and nano κ-carbides (Fe_3AlC_(0.5)) precipitates, while those of compacts with 2 and 4 at%C are composed of nanocrystalline Fe_3Al of about 80 nm in diameter, nano κ-carbides and small amount of large α-grains of about 1 μm in diameter. These structures maintain the nanostructure even at 973 K, that is, they have the good thermal stability. The mechanical properties of these compacts were measured by compression tests at room temperature (RT) to 973 K in vacuum. The compacts with 1 and 2 at%C of this work perform the superior mechanical properties (e.g. yield strength of 2150 MPa and rupture strain of 0.14 for compact with 2 at%C at R.T.) when compared with the ordinary Fe_3 Al casting (e.g. the yield strength of 380 MPa and rupture strain of 0.12).
机译：研究了通过机械合金化（MA）和随后的火花等离子体烧结（SPS）制备的块状纳米晶Fe-Al-C合金的微观结构和优异的力学性能。 MA用铁和铝粉在添加甲醇的条件下，用MA生产了三种纳米晶的Fe-24 at％Al-X at％C（X = 1,2,4）合金粉末，随后在1073-1273 K通过SPS达到64 MPa。这些压块的相对密度为99.97％（1 at％C）至99.5％（4 at％C）。具有1at％C的压实体的结构由直径为1.5μm的Fe_3Al晶粒和纳米κ碳化物（Fe_3AlC_（0.5））沉淀物组成，而具有2at％和4at％C的压实体的那些结构由纳米晶Fe_3Al组成直径80 nm，纳米κ碳化物和少量直径约1μm的大α晶粒。这些结构甚至在973 K时仍保持纳米结构，也就是说，它们具有良好的热稳定性。这些压块的机械性能是通过在室温（RT）到真空下973 K的压缩试验来测量的。与普通的Fe_3 Al铸件（例如，铸件）相比，这项工作中具有1和2 at％C的压坯具有优异的机械性能（例如，在室温下具有2 at％C的压坯，屈服强度为2150 MPa，断裂应变为0.14）。屈服强度为380 MPa，断裂应变为0.12）。

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