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Ti-60Ta合金快速凝固過程中的相變研究
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西北有色金屬研究院

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國家重點研發(fā)計劃項目(2017YFB0305800)


Research on Phase Transformation of Ti-60Ta Alloy during Rapid Solidification
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1.State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous Metal Research,Xi’an,Shaanxi,710016;2.P.R. China

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    摘要:

    本文采用真空自耗電弧熔煉和熱鍛技術(shù)制備出Ti-60Ta合金棒，用PREP制粉技術(shù)制備出其球形粉末，并對棒材取塊樣進行高溫淬火處理。利用SEM、XRD、TEM、DSC等分析手段對Ti-60Ta合金在快速凝固過程中的相變行為進行了研究。結(jié)果表明，Ti-60Ta原始塊樣和Ti-60Ta合金粉末主要以bcc結(jié)構(gòu)的β相為主；隨著粉末粒徑減小，快速凝固過程中冷卻速率增高，α"馬氏體相逐漸增多，β相逐漸減少；原始塊樣經(jīng)過1000℃/60min保溫、淬火處理，生成了少量α"馬氏體相；TEM圖像和電子衍射斑點分析表明，在冷卻速率更高的Ti-60Ta合金粉末中觀察到板條狀α "馬氏體，寬度大約為50納米，α"馬氏體相優(yōu)先生成于晶界處。

    Abstract:

    In this study, the Ti-60Ta alloy bars were prepared by vacuum arc smelting and then forging process. The bulk samples of Ti-60Ta alloy were cut from the bars, some of them were quenched in the water. The spherical powder of Ti-60Ta alloy were prepared by PREP (plasma rotating electrode process). The microstructure and phase transition process were characterized by SEM, XRD, TEM, DSC and so on. It revealed that both of the bulk samples and powders were mainly composed of β-Ti with bcc structure. With the powder size decreasing, the cooling rate was increased during the rapid solidification process, the content of α" martensite phase increased, while the content of β-Ti decreased gradually. The bulk samples were kept at 1000℃ for 60min then quenched in the water, resulting in a small amount of α" martensite phase. The results of TEM and SEAD revealed the lath α" martensite phase with a width of 50 nanometers formed in the powders after rapid solidification, the α" martensite phase mainly precipitated at grain boundaries.

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趙少陽,殷京甌,王利卿,沈 壘,談 萍,李增峰. Ti-60Ta合金快速凝固過程中的相變研究[J].稀有金屬材料與工程,2022,51(3):934~939.[Zhao Shaoyang, Yin Jinou, Wang Liqing, Shen Lei, Tan Pin, Li Zengfeng. Research on Phase Transformation of Ti-60Ta Alloy during Rapid Solidification[J]. Rare Metal Materials and Engineering,2022,51(3):934~939.]
DOI：10.12442/j. issn.1002-185X.20200367

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  • 收稿日期:2020-05-28
  • 最后修改日期:2020-07-29
  • 錄用日期:2020-08-04
  • 在線發(fā)布日期: 2022-04-06
  • 出版日期: 2022-03-30