Ti3AlC2 MAX相对原位合成TiAl金属间化合物性能的影响第二部分:阶段演化

M. Akhlaghi, E. Salahi, S. A. Tayebifard, G. Schmidt
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引用次数: 1

摘要

在本研究系列论文的第二部分中,通过x射线衍射(XRD)分析和Rietveld细化法研究了TiAl-Ti3AlC2复合材料在制造过程中的相演化。采用火花等离子烧结(SPS)技术,在900℃、40 MPa、7 min条件下对金属Ti和Al粉末进行球磨和致密化处理,制备了含不同Ti3AlC2添加剂量(10%、15%、20%、25%和30% wt%)的粉末。烧结前通过XRD测试,证实粉末混合物中含有金属Ti和Al,以及Ti3AlC2和TiC(由Ti3AlC2合成的侧相)相。在烧结复合材料中发现了TiAl和Ti3Al金属间化合物的原位合成,Ti3AlC2的存在以及Ti2AlC MAX相的形成。基于XRD谱图,采用Rietveld细化法计算样品最终组成中各相的重量百分比和不同相的晶粒尺寸。比较了烧结试样中Ti3AlC2的晶粒尺寸与合成Ti3AlC2粉末的晶粒尺寸。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part II: Phase evolution
In this research, the 2nd part of a series of papers on the processing and characterization of TiAl–Ti3AlC2 composites, the phase evolution during the manufacturing process was investigated by X-ray diffraction (XRD) analysis and Rietveld refinement method. Metallic Ti and Al powders with different amounts of previously-synthesized Ti3AlC2 additives (10, 15, 20, 25 and 30 wt%) were ball-milled and densified by spark plasma sintering (SPS) under 40 MPa for 7 min at 900 °C. Before the sintering process, XRD test verified that the powder mixtures contained metallic Ti and Al as well as Ti3AlC2 and TiC (lateral phase synthesized with Ti3AlC2) phases. In the sintered composites, the in-situ synthesis of TiAl and Ti3Al intermetallics as well as the presence of Ti3AlC2 and the formation and Ti2AlC MAX phases were disclosed. The weight percentage of each phase in the final composition of the samples and the crystallite size of different phases were calculated by the Rietveld refinement method based on the XRD patterns. The size of Ti3AlC2 crystallites in sintered samples was compared with the crystallite size of synthesized Ti3AlC2 powder.
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