50Al50 (at%)合金;Ti-Cu-Ni-Nb-Al-Zr-Hf非晶釬料;真空釬焊;顯微組織;剪切強(qiáng)度"/> 50Al50 (at%)合金的真空釬焊連接，并研究了釬焊溫度對釬焊接頭的顯微組織、剪切強(qiáng)度的影響規(guī)律。結(jié)果表明，在任何釬焊溫度下獲得的Ti50Al50釬焊接頭均有3個界面反應(yīng)層且每個反應(yīng)層都含有α2-Ti3Al和Ti2Cu(Ni) 2個物相。隨著釬焊溫度的增加，α2-Ti3Al和Ti2Cu(Ni)在釬焊接頭中的尺寸與分布發(fā)生了明顯的變化，尤其是等溫凝固層Ⅱ中的Ti2Cu(Ni)相。1200 ℃下穩(wěn)定存在的連續(xù)α2-Ti3Al層Ⅰ對母材和釬料原子的相互擴(kuò)散具有阻隔壁壘作用，溫度一旦超過1200 ℃，α2-Ti3Al相變得不穩(wěn)定使得連續(xù)α2-Ti3Al層被打破從而失去阻隔壁壘效應(yīng)。在釬縫中析出且彌散分布的α2-Ti3Al對焊縫中物相的形成可以起到抑制形核和細(xì)化晶粒的作用。隨著釬焊溫度升高，Ti50Al50釬焊接頭平均抗剪切強(qiáng)度先增加后減小，在釬焊溫度1180 ℃、釬焊時間30 min時釬焊接頭的抗剪切強(qiáng)度最大，達(dá)184 MPa。剪切斷口表面呈典型解理斷裂特征且α2-Ti3Al占絕大多數(shù)。"/>

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Ti-Cu-Ni-Nb-Al-Zr-Hf非晶釬料合金真空釬焊Ti50Al50 接頭的界面組織與剪切強(qiáng)度
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1.華東交通大學(xué) 材料科學(xué)與工程學(xué)院，江西 南昌 330013;2.華南理工大學(xué) 國家金屬材料近凈成形工程技術(shù)研究中心，廣東 廣州 510640

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Interfacial Microstructure and Shear Strength of Ti50Al50 Joint Vacuum Brazed with Ti-Cu-Ni-Nb-Al-Zr-Hf Amorphous Filler Alloy
Author:
Affiliation:

1.School of Materials Science & Engineering, East China Jiaotong University, Nanchang 330013, China;2.National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China

Fund Project:

National Natural Science Foundation of China (51865012); Natural Science Foundation of Jiangxi Province (20202BABL204040); Open Foundation of National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, China (2016005); Science Foundation of Educational Department of Jiangxi Province, China (GJJ170372); GF Basic Research Project, China (JCKY2016603C003); Research Project of Special Furnishment and Part, China (JPPT125GH038)

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    摘要:

    在釬焊溫度1140~1220 ℃、釬焊時間30 min的工藝參數(shù)下，采用Ti-9.5Cu-8Ni-8Nb-7Al-2.5Zr-1.8Hf（質(zhì)量分?jǐn)?shù)，%）非晶釬料成功實現(xiàn)了Ti50Al50 (at%)合金的真空釬焊連接，并研究了釬焊溫度對釬焊接頭的顯微組織、剪切強(qiáng)度的影響規(guī)律。結(jié)果表明，在任何釬焊溫度下獲得的Ti50Al50釬焊接頭均有3個界面反應(yīng)層且每個反應(yīng)層都含有α2-Ti3Al和Ti2Cu(Ni) 2個物相。隨著釬焊溫度的增加，α2-Ti3Al和Ti2Cu(Ni)在釬焊接頭中的尺寸與分布發(fā)生了明顯的變化，尤其是等溫凝固層Ⅱ中的Ti2Cu(Ni)相。1200 ℃下穩(wěn)定存在的連續(xù)α2-Ti3Al層Ⅰ對母材和釬料原子的相互擴(kuò)散具有阻隔壁壘作用，溫度一旦超過1200 ℃，α2-Ti3Al相變得不穩(wěn)定使得連續(xù)α2-Ti3Al層被打破從而失去阻隔壁壘效應(yīng)。在釬縫中析出且彌散分布的α2-Ti3Al對焊縫中物相的形成可以起到抑制形核和細(xì)化晶粒的作用。隨著釬焊溫度升高，Ti50Al50釬焊接頭平均抗剪切強(qiáng)度先增加后減小，在釬焊溫度1180 ℃、釬焊時間30 min時釬焊接頭的抗剪切強(qiáng)度最大，達(dá)184 MPa。剪切斷口表面呈典型解理斷裂特征且α2-Ti3Al占絕大多數(shù)。

    Abstract:

    Amorphous Ti-9.5Cu-8Ni-8Nb-7Al-2.5Zr-1.8Hf (wt%) filler alloy was employed to vacuum braze Ti50Al50 (at%) alloy at the brazing temperatures ranging from 1140 to 1220 °C for 30 min. The effect of brazing temperature on the microstructure and shear strength of the brazed joints was investigated. Results show that all the brazed joints are mainly divided into three reaction layers regardless of the brazing temperature, and both of α2-Ti3Al and Ti2Cu(Ni) phases exist in each reaction layer, but their size and distribution change significantly with brazing temperature, especially the Ti2Cu(Ni) phase in isothermal solidification layer Ⅱ. The continuous α2-Ti3Al layer Ⅰ is stable below 1200 °C but breaks and loses its barrier effect above 1200 °C. It is notable that the α2-Ti3Al precipitated in the brazed seam can act as a nucleation inhibitor and refine the crystal grain. Shear test results show that the average shear strength of Ti50Al50 brazed joints first increases and then decreases with brazing temperature and the maximum shear strength of 184 MPa is obtained at 1180 °C. α2-Ti3Al mainly occupies the fracture surface with cleavage characteristics.

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李力,趙巍,馮志雪,張玉鑫,黃志超,李小強(qiáng).Ti-Cu-Ni-Nb-Al-Zr-Hf非晶釬料合金真空釬焊Ti50Al50 接頭的界面組織與剪切強(qiáng)度[J].稀有金屬材料與工程,2022,51(2):378~385.[Li Li, Zhao Wei, Feng Zhixue, Zhang Yuxin, Huang Zhichao, Li Xiaoqiang. Interfacial Microstructure and Shear Strength of Ti50Al50 Joint Vacuum Brazed with Ti-Cu-Ni-Nb-Al-Zr-Hf Amorphous Filler Alloy[J]. Rare Metal Materials and Engineering,2022,51(2):378~385.]
DOI：10.12442/j. issn.1002-185X.20200940

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  • 收稿日期:2020-12-07
  • 最后修改日期:2021-01-23
  • 錄用日期:2021-02-04
  • 在線發(fā)布日期: 2022-03-03
  • 出版日期: 2022-02-28