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Synthesis of Ultrafine Crystal/Nanocrystalline TiAl-based Alloy by in Situ Sintering
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Synthesis of Ultrafine Crystal/Nanocrystalline TiAl-based Alloy by in Situ Sintering
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National Natural Science Foundation of China (51371038)

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    摘要:

    研究了原位燒結(jié)法制備TiAl基超細(xì)晶/納米晶合金。首先，通過球磨方式細(xì)化TiH2, Al, Si 和 Nb 粉，然后將球磨后粉末進(jìn)行放電等離子燒結(jié)。利用X射線衍射儀、掃描電鏡和透射電鏡分析球磨粉末及其燒結(jié)塊體的特性，利用差熱分析儀測(cè)試高溫抗氧化性。試驗(yàn)結(jié)果顯示，球磨過程中產(chǎn)生了非晶、Ti3Al納米晶和TiH2的分解產(chǎn)物，球磨后粉末經(jīng)高溫?zé)Y(jié)時(shí)，這些細(xì)小粉末迅速地轉(zhuǎn)變成TiAl和Ti3Al相，TiAl相的晶粒尺寸為500 nm~1 μm，Ti3Al相為幾個(gè)納米，這種超細(xì)燒結(jié)組織在1000 ℃下非常穩(wěn)定，而且具有良好的抗氧化性

    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

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陳 華,周慧敏,鄒 陽. Synthesis of Ultrafine Crystal/Nanocrystalline TiAl-based Alloy by in Situ Sintering[J].稀有金屬材料與工程,2015,44(10):2387~2390.[Chen Hua, Zhou Huimin, Zou Yang. Synthesis of Ultrafine Crystal/Nanocrystalline TiAl-based Alloy by in Situ Sintering[J]. Rare Metal Materials and Engineering,2015,44(10):2387~2390.]
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  • 收稿日期:2014-10-25
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  • 在線發(fā)布日期: 2016-07-13
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