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攪拌頭偏移對Ti/Al異種金屬攪拌摩擦焊接頭成形及拉伸強(qiáng)度的影響
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航空制造工程學(xué)院 南昌航空大學(xué)

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國家自然科學(xué)基金(51265042)、江西省優(yōu)勢科技創(chuàng)新團(tuán)隊(duì)建設(shè)專項(xiàng)計(jì)劃項(xiàng)目（20171BCB24007）、江西省自然科學(xué)基金(20114BAB206006)


Effect of Tool Offset on Weld Formation and Tensile Strength of Friction Stir Welded Ti/Al Dissimilar Metal Joints
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Nanchang Hangkong University

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    摘要:

    采用攪拌摩擦焊(FSW)完成了3 mm厚TC4鈦合金和2A14-T14鋁合金的連接,研究了攪拌頭偏移對接頭的成形及拉伸性能的影響。結(jié)果表明在攪拌頭向鋁合金側(cè)的偏移對接頭的最大抗拉強(qiáng)度有顯著的影響。接頭最大抗拉強(qiáng)度隨攪拌頭的偏移量的增加逐漸升高。在偏移量為2.0 mm、攪拌頭轉(zhuǎn)速從400 r/min增加到700 r/min時(shí),接頭的最大抗拉強(qiáng)度逐漸降低。在偏移量為2.5 mm、接頭的最大抗拉強(qiáng)度隨轉(zhuǎn)速的增加逐漸升高。當(dāng)在攪拌頭轉(zhuǎn)速為700 r/min, 焊接速度為60 mm/min時(shí),所得接頭強(qiáng)度最高,約347 MPa,為鋁合金母材的83 %。接頭的斷裂位置和拉伸強(qiáng)度均取決于微觀組織和金屬間化合物。對于強(qiáng)度最高的接頭,由于TiAl相的生成,接頭于鋁合金側(cè)熱影響區(qū)發(fā)生斷裂。

    Abstract:

    3mm thick TC4 titanium alloy and 2A14-T4 aluminum alloy were well joined by friction stir welding (FSW), and the influence of tool offset on weld formation and tensile property of the joints was investigated. The results show that tool offset to the Al side has significant influence on ultimate tensile strength (UTS) of the joints. With the increase of tool offset, the UTS increases gradually. When the tool offset is 2.0mm, the UTS of the joint decreases with increasing tool rotation speed from 400r/min to 700r/min. However, when the tool offset is increased to 2.5mm, the UTS of the joint increase with the increase of tool rotation speed. A tool rotation speed of 700r/min and a welding speed of 60mm/min is matched, the highest UST of 347MPa of the joint is obtained, which reaches to about 83% of Al matrix. The tensile results prove that the fracture location and tensile strength of the joints mainly depend on microstructure and intermetallic phases. For the joint with the highest strength, the fracture occurs in the heat affected zone (HAZ) of Al matrix due to brittle TiAl phase formed in the joint.

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陳玉華,曹文明,周興汶,李樹寒,戈軍委.攪拌頭偏移對Ti/Al異種金屬攪拌摩擦焊接頭成形及拉伸強(qiáng)度的影響[J].稀有金屬材料與工程,2019,48(1):63~70.[Chen Yuhua, Cao Wenming, zhouxingwen, Li Shuhan, Ge Junwei. Effect of Tool Offset on Weld Formation and Tensile Strength of Friction Stir Welded Ti/Al Dissimilar Metal Joints[J]. Rare Metal Materials and Engineering,2019,48(1):63~70.]
DOI：10.12442/j. issn.1002-185X.20170599

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  • 收稿日期:2017-07-07
  • 最后修改日期:2017-11-22
  • 錄用日期:2018-01-09
  • 在線發(fā)布日期: 2019-02-18
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