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時效溫度對Ti1023和Ti5553合金a相析出行為與力學(xué)性能的影響規(guī)律
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1.西安交通大學(xué);2.中南大學(xué)

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國家科學(xué)自然基金（51671158, 51621063）；國家重點(diǎn)基礎(chǔ)研究發(fā)展計劃（“973”計劃課題）（2014CB644003）；高等學(xué)校學(xué)科創(chuàng)新引智計劃2.0(PB2018008)


The effect of microstructure and mechanical properties in Ti1023 and Ti5553 alloys during different aging temperature
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1.Xi’an Jiaotong University,State Key Laboratory for Mechanical Behavior of Materials,Xi’an;2.Central South University,State Key Laboratory for Powder Metallurgy

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    摘要:

    本文研究了Ti1023和Ti5553鈦合金經(jīng)過固溶與低溫時效處理(ST-SQA)獲得的微觀組織和析出硬化行為。采用掃描電鏡和透射電鏡觀察了不同溫度時效處理后α相的析出形貌以及分布特點(diǎn)，統(tǒng)計了時效析出次生α相的析出密度和寬度隨時效溫度的變化情況，并測試了合金的維氏硬度。結(jié)果表明： Ti1023合金時效處理時次生α的析出溫度低于Ti 5553合金。Ti1023合金在300℃時效時α相已經(jīng)析出，400℃時α相析出密度到達(dá)峰值；Ti5553合金在450-500℃時效α相開始析出，在550℃時效α相的析出密度達(dá)到峰值。Ti1023合金硬度隨著時效溫度的增加先升后降，400℃時效硬度最高；在相同的時效溫度范圍，Ti5553合金硬度變化出現(xiàn)雙峰規(guī)律，硬度峰值分別對應(yīng)于350℃和550℃時效溫度。兩種合金的硬度變化規(guī)律源于合金時效中第二相的析出行為：時效溫度低于400℃，Ti1023合金的硬度取決于α相和?相，而Ti5553合金的硬度取決于?相；溫度高于400℃，兩種合金的硬度主要取決于次生α相的數(shù)量與尺寸。

    Abstract:

    The microstructures and precipitation hardening of Ti1023 and Ti5553 alloys in the same solution treatment and step-quench aging treatment (ST-SQA) have been studied. The morphology of α phase about precipitation and distribution in different aging treatment were observed carefully by using SEM and TEM, and the variation of density and width of secondary α phase were analyzed. The hardness of these two alloys was measured. The result shows that: Ti1023 alloy is more likely to precipitate α phase than Ti5553 alloy due to low stability of ? phase. Ti1023 alloy precipitates α phase at 300℃ aging and get the maximum density of precipitation at 400℃,while Ti5553 alloy precipitates α phase at 450℃, and get the maximum density of precipitation at 550℃. As for Ti1023 alloy, the peak of hardness is obtained at 400℃ aging, while as for Ti5553 alloy, double peaks of hardness are shown at 350℃ and 550℃ aging, respectively. The variation of hardness was caused by the precipitation of secondary phase in ? phase for different aging temperatures. When aging temperature is below 400℃, the hardness of Ti1023 alloy depends on both α phase and ω phase, and the hardness of Ti15553 alloy depends on only ω phase. As aging temperature is over 400℃, the hardness of both Ti1023 and Ti5553 alloys depend on the density of precipitation and the size of α phase.

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引用本文

王文婷,李沛,孫巧艷,劉彬,肖林,孫軍.時效溫度對Ti1023和Ti5553合金a相析出行為與力學(xué)性能的影響規(guī)律[J].稀有金屬材料與工程,2020,49(5):1707~1714.[Wenting Wang, Pei Li, Qiaoyan Sun, Bin Liu, Lin Xiao, Jun Sun. The effect of microstructure and mechanical properties in Ti1023 and Ti5553 alloys during different aging temperature[J]. Rare Metal Materials and Engineering,2020,49(5):1707~1714.]
DOI：10.12442/j. issn.1002-185X.20190157

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  • 收稿日期:2019-02-26
  • 最后修改日期:2019-06-26
  • 錄用日期:2019-07-02
  • 在線發(fā)布日期: 2020-06-05
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