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原位烧结法合成超细晶/纳米晶TiAl基合金(英文) 被引量:5

Synthesis of Ultrafine Crystal/Nanocrystalline TiAl-based Alloy by in Situ Sintering
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摘要 研究了原位烧结法制备TiAl基超细晶/纳米晶合金。首先,通过球磨方式细化TiH2,Al,Si和Nb粉,然后将球磨后粉末进行放电等离子烧结。利用X射线衍射仪、扫描电镜和透射电镜分析球磨粉末及其烧结块体的特性,利用差热分析仪测试高温抗氧化性。试验结果显示,球磨过程中产生了非晶、Ti3Al纳米晶和TiH2的分解产物,球磨后粉末经高温烧结时,这些细小粉末迅速地转变成TiAl和Ti3Al相,TiAl相的晶粒尺寸为500 nm^1μm,Ti3Al相为几个纳米,这种超细烧结组织在1000℃下非常稳定,而且具有良好的抗氧化性。 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 ℃, and has excellent oxidation resistance.
机构地区 长春工业大学
出处 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2015年第10期2387-2390,共4页 Rare Metal Materials and Engineering
基金 National Natural Science Foundation of China(51371038)
关键词 TIAL基合金 原位烧结 超细晶/纳米晶 循环氧化 TiAl based-alloy in situ sintering ultrafine crystal/nanocrystalline cyclic oxidation
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