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雙步球磨與放電等離子燒結(jié)制備細晶TiAl合金
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國家自然科學基金項目(50673047)


Fine-Grained TiAl Alloy Prepared by Double Mechanical Milling and Spark Plasma Sintering
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    摘要:

    采用雙步球磨法和放電等離子燒結(jié)(SPS)技術(shù)制備細晶Ti-47Al(at%)合金，利用掃描電子顯微鏡(SEM)、X射線衍射(XRD)儀以及透射電子顯微鏡(TEM)等分析測試手段對球磨后的粉末形貌結(jié)構(gòu)、相組成以及燒結(jié)塊體的顯微組織結(jié)構(gòu)進行觀察和分析。結(jié)果表明：雙步球磨粉末的顆粒形狀較規(guī)則，其顆粒尺寸在20~40 μm之間，內(nèi)部結(jié)構(gòu)均勻，主要由TiAl和Ti3Al相組成。放電等離子燒結(jié)后的塊體主要由主相TiAl和少量的Ti3Al相及Ti2Al相組成，隨著燒結(jié)溫度的升高，Ti3Al相含量有所增加。當燒結(jié)溫度為1000 ℃時，燒結(jié)塊體獲得的主要是等軸晶組織，等軸晶粒尺寸大多數(shù)在100~250 nm之間。當燒結(jié)溫度為1100 ℃時，燒結(jié)塊體致密、無孔洞，等軸晶粒有明顯長大的現(xiàn)象，顯微組織主要由等軸狀的TiAl相和片層狀的Ti3Al相組成

    Abstract:

    Fine-grained Ti-47Al (at%) alloy was prepared by double mechanical milling and spark plasma sintering (SPS). The morphology, microstructure and phase composition of the Ti-47Al composite powder and the microstructure of the bulk Ti-47Al alloy samples were studied by SEM, XRD and TEM. The results show that the double mechanical milled powder is composed of TiAl and Ti3Al phases, with regular particle shape and 20-40 μm particle size, as well as uniform interstructure. The SPSed bulk of Ti-47Al alloy consists of main phase TiAl and few phases Ti3Al and Ti2Al. With the sintering temperature increasing, the Ti3Al phase becomes more. For the bulk sintered at 1000 oC, the equiaxed grain microstructure is achieved with sizes in the range of 100-250 nm. For the bulk sintered at 1100 oC, the sizes of equiaxed grain significantly are increased. The SPSed bulk samples exhibit dense microstructure without pores, consisting of equiaxed TiAl phase and lamellar Ti3Al phase

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肖樹龍,田 竟,徐麗娟,陳玉勇,于宏寶,韓杰才,張德良.雙步球磨與放電等離子燒結(jié)制備細晶TiAl合金[J].稀有金屬材料與工程,2011,40(5):880~884.[Xiao Shulong, Tian Jing, Xu Lijuan, Chen Yuyong, Yu Hongbao, Han Jiecai, Zhang Deliang. Fine-Grained TiAl Alloy Prepared by Double Mechanical Milling and Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2011,40(5):880~884.]
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  • 收稿日期:2010-05-20
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