的組織與性能
(西北工業(yè)大學(xué) 材料學(xué)院，西安 710072)
摘 要: 利用感應(yīng)電磁場(chǎng)對(duì)焊接過(guò)程熱與物質(zhì)流動(dòng)作用，改善異種金屬摩擦焊接頭的組織與性能。采用光學(xué)金相、掃描電鏡及室溫拉伸實(shí)驗(yàn)與對(duì)比分析的方法，研究了外加電磁場(chǎng)對(duì)弱磁性材料TC4鈦合金與LD10鋁合金摩擦焊接頭焊合區(qū)的顯微組織、主要合金元素?cái)U(kuò)散行為及室溫力學(xué)性能的影響。結(jié)果表明：外加電磁場(chǎng)作用使TC4鈦合金與LD10鋁合金摩擦焊接頭鋁合金側(cè)動(dòng)態(tài)再結(jié)晶區(qū)寬度增大；同時(shí)，感應(yīng)電磁場(chǎng)通過(guò)影響摩擦副合金材料內(nèi)部電子密度狀態(tài)等，促進(jìn)了摩擦焊接過(guò)程中主要合金元素Al和Ti在焊合區(qū)的擴(kuò)散過(guò)程，并且提高了TC4鈦合金與LD10鋁合金摩擦焊接頭的拉伸強(qiáng)度。其中，外加電磁場(chǎng)在頂鍛保壓階段的影響更為明顯。
關(guān)鍵字: TC4鈦合金；LD10鋁合金；電磁場(chǎng)；摩擦焊接；顯微組織
induction friction welded joint
of TC4 Ti alloy and LD10 Al alloy
（College of Materials Science, Northwestern Polytechnical University,
Xi’an 710072, China）
Abstract:By means of optical microscopy, EDX analysis and tensile test, the influence of the electromagnetic field on the microstructure characteristics, diffusion behavior and mechanical properties of friction welded joints between TC4 Ti alloy and LD10 Al alloy was explored. The results indicate that the width of dynamic recrystallization zone of friction welding joint between TC4 Ti alloy and LD10 Al alloy increases under the electromagnetic field. In addition, the diffusion zones of main alloying elements become wider, especially when the electromagnetic field is applied during the forging process. Meanwhile, the tensile strength of friction welding joint is improved obviously when the electromagnetic field is applied during the forging process of TC4 Ti alloy and LD10 Al alloy.
Key words: TC4 titanium alloy; LD10 aluminium alloy; electromagnetic field; friction welding; microstructure
