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TC4/OFC真空擴散焊接研究
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湖北省創(chuàng)新群體項目（2008CDA011）；國家自然科學基金（10574102）


Study on Diffusion Welding of TC4/OFC in Vacuum
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    摘要:

    對鈦合金（TC4）與無氧純銅（OFC）異種金屬在真空條件下進行直接擴散焊接，可形成良好的TC4/ OFC焊接接頭。測量其焊接強度及進行微區(qū)分析的結(jié)果表明，隨著溫度升高，焊接接頭的抗拉強度先升高后下降，最佳焊接工藝參數(shù)為：焊接溫度800 ℃，保溫時間30 min，焊接壓力5 MPa。在TC4/ OFC焊接接頭的界面上形成了元素成分逐漸變化的互擴散層。由元素分析和斷口的XRD分析結(jié)果可以看出，界面處生成的物相有Cu3Ti2、Cu4Ti3、CuTi、Cu4Ti等金屬間化合物，斷口的形貌表明接頭斷裂主要發(fā)生在接頭的金屬間化合物弱結(jié)合處，結(jié)合處的孔洞與銅鈦金屬間化合物的種類、厚度決定了TC4/OFC直接擴散焊接接頭的強度。

    Abstract:

    Diffusion bonding was carried out between titanium alloy (TC4) and oxygen free copper (OFC) in vacuum and good transition joints were formed. The microstructure and elements’ composition were characterized by XRD, SEM and EDX. The tensile strength of the welding joint was measured. The results show that with the welding temperature increasing, the tensile strength of the welding joint increased first and then decreased. Thus the optimum welding parameters were 800 °C , 5 MPa and 30 min. The interdiffused layer with gradually varied element composition was formed at the interface of TC4/OFC welding joint. Cu3Ti2, Cu4Ti3, CuTi and Cu4Ti were formed at the interface of titanium and copper. The fracture morphology indicates that the fracture mainly took place at the weak bond of TC4/OFC interface. And the pores at the joints and species and thickness of the intermetallics played an important role in the bond strength of TC4/OFC.

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蘇小鵬,羅國強,沈 強,曾 浩,王傳彬,張聯(lián)盟. TC4/OFC真空擴散焊接研究[J].稀有金屬材料與工程,2010,39(11):2044~2047.[Su Xiaopeng, Luo Guoqiang, Shen Qiang, Zeng Hao, Wang Chuanbin, Zhang Lianmeng. Study on Diffusion Welding of TC4/OFC in Vacuum[J]. Rare Metal Materials and Engineering,2010,39(11):2044~2047.]
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  • 收稿日期:2009-11-26
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