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連接溫度對高鈮TiAl合金擴(kuò)散接頭組織和強(qiáng)度的影響
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哈爾濱工業(yè)大學(xué) 先進(jìn)焊接與連接國家重點(diǎn)實(shí)驗室,哈爾濱工業(yè)大學(xué) 先進(jìn)焊接與連接國家重點(diǎn)實(shí)驗室

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中圖分類號:

TG454

基金項目:

國家科技重大專項資助，國家自然科學(xué)基金項目（面上項目，重點(diǎn)項目，重大項目），上海航天科技創(chuàng)新基金


Effect of Bonding Temperature on Microstructure and Strength of High Nb Containing TiAl Alloy Diffusion Joints
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Affiliation:

Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining

Fund Project:

National Science and technology major special fund, National Natural Science Foundation of China(general project, Key project, Major project), Shanghai Aerospace Science and Technology Innovation Fund

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    摘要:

    摘 要: 在連接工藝參數(shù)為1000℃～1200℃/25MPa/90min情況下，對高鈮TiAl合金（TAN）進(jìn)行直接擴(kuò)散連接。采用SEM、EDS、XRD和EBSD等方法對連接界面微觀組織進(jìn)行分析，并研究了連接溫度對接頭界面結(jié)構(gòu)和剪切強(qiáng)度的影響。結(jié)果表明：當(dāng)連接溫度T<1100℃時，連接界面清晰垂直，繼續(xù)升高溫度，界面消失；擴(kuò)散連接過程中，連接界面處出現(xiàn)再結(jié)晶現(xiàn)象，隨著連接溫度的升高，再結(jié)晶晶粒不斷增多并長大，并且再結(jié)晶區(qū)域出現(xiàn)大量α2相；當(dāng)連接溫度達(dá)到1150℃時，接頭平均抗剪強(qiáng)度達(dá)到最大值為105MPa。

    Abstract:

    Abstract: Direct diffusion bonding of high Nb containing TiAl alloy(TAN) has been conducted at temperatures of 1000℃～1200℃ for 90min under 25MPa in vacuum. The effect of bonding temperature on interfacial microstructure and mechanical properities of joints was studied and the microstructure of joints was detected by using SEM, EDS, XRD and EBSD. The results indicate that the distinct interface can be seen when the temperature is below 1100℃ and the higher temperature promotes interface disappear; recrystallized grains are observed at bonding interface. The number and size of grains increase with the rise of temperature and a lot of α2 phase appears in the area of recrystallization; the highest average shear strength of 105 MPa was achieved when bonded at the temperature of 1150℃ for 90min under 25MPa.

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包潘飛,宋曉國.連接溫度對高鈮TiAl合金擴(kuò)散接頭組織和強(qiáng)度的影響[J].稀有金屬材料與工程,2018,47(7):2132~2136.[Bao Panfei, Song Xiaoguo. Effect of Bonding Temperature on Microstructure and Strength of High Nb Containing TiAl Alloy Diffusion Joints[J]. Rare Metal Materials and Engineering,2018,47(7):2132~2136.]
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  • 收稿日期:2016-07-04
  • 最后修改日期:2016-08-25
  • 錄用日期:2016-09-18
  • 在線發(fā)布日期: 2018-10-10
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