所属单位：材料科学工程学院

发表刊物：稀有金属材料与工程

项目来源：国家自然科学基金项目

关键字：TiAl based-alloy; in situ sintering; ultrafine crystal/nanocrystalline; cyclic oxidation

摘要：The preparation of TiAl-based alloys with ultrafine crystal/nanocrystalline by in situ sintering was investigated. TiH2, Al, Si and Nb powders were firstly refined to the nanoscale level by ball milling; then, the milled powders were pressed into green compacts, which were sintered into bulks by spark plasma sintering (SPS). The functional characteristics of milled powders and sintered bulk were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). High temperature oxidation resistance was examined by differential scanning calorimeter (DSC). The results reveal that amorphous products, Ti3Al nanocrystalline and decomposition products of TiH2 are formed during milling. When milled powders are sintered at high temperature, these fine powders rapidly transform into TiAl and Ti3Al phase. The grain sizes of TiAl and Ti3Al are 500 nm~1 μm and a few nanometers, respectively. This sintered bulk ultrafine microstructure is quite stable below 1000 ºC, and has excellent oxidation resistance.

合写作者：周慧敏,邹阳

第一作者：陈华

论文类型：期刊论文

卷号：44

期号：10

页面范围：2

字数：1

ISSN号：1002-185X

是否译文：否

CN号：61-1154

发表时间：2015-10-02