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Affiliation of Author(s):材料科学工程学院

Journal:稀有金属材料与工程

Funded by:国家自然科学基金项目

Key Words:TiAl based-alloy; in situ sintering; ultrafine crystal/nanocrystalline; cyclic oxidation

Abstract: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.

Co-author:周慧敏,邹阳

First Author:chenhua

Indexed by:Journal paper

Volume:44

Issue:10

Page Number:2

Number of Words:1

ISSN No.:1002-185X

Translation or Not:no

CN No.:61-1154

Date of Publication:2015-10-02