以元素粉末为原料,采用机械合金化方法结合放电等离子烧结工艺制各了Ti-SMo-(0～9)Fe合金材料,并探讨了制备工艺对球磨粉体及烧结态合金性能的影响规律.结果表明,当铁含量为3％～9％(质量分数)时,球磨10h粉体经900℃烧结可获得高致密度、并具有超细晶结构的钛合金材料,其显微组织主要由β-Ti相基体及fcc-Ti颗粒组成,其晶粒尺寸为130～490 nm,这是在钛合金块体材料中首次制备出fcc结构Ti相.在机械合金化过程中,Fe元素的加入可显著提高合金体系的非晶形成能力,并随Fe含量增加体系非晶形成能力增强,粉末非晶相比例增加,经10h高能球磨后,即可合成具有良好的热稳定性的非晶/纳米晶Ti-Mo-Fe复合粉末.
Ti-8Mo-(0～9)Fe alloys were processed by mechanical alloying (MA) and subsequent spark plasma sintering (SPS) from elemental powders.The influences of preparation parameters on the performance of milled powders and sintered alloys were studied.The results show that in the Fe content range of 3 wt％～9 wt％ titanium based alloys with high density and ultra-fine grain structure can be produced by SPS at 900 ℃ from the powders milled for 10 h.The microstructure of the titanium alloys mainly consists of β-Ti phase matrix and fcc-Ti particles,and the average grain size is in the range of 130～490 nm.It is the first time when titanium based alloys with face-centered cubic structure are produced.During the mechanical alloying process,the addition of Fe element greatly improves the glass forming ability of the alloy system,and the ability and the volume fraction of amorphous phase in the powders are obviously enhanced with increasing of Fe content.After high-energy ball-milling for 10 h,amorphous/nanocrystalline Ti-Mo-Fe composite powders exhibit favorable thermostability.
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