(1. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009；
2. 中國航天科工集團(tuán) 第三研究院 306研究所，北京 100074)
摘 要: 采用真空熱壓擴(kuò)散工藝，進(jìn)行Ti2AlNb基合金的固態(tài)擴(kuò)散連接，利用掃描電子顯微鏡及拉伸試驗(yàn)，對(duì)連接界面進(jìn)行了組織和性能分析。結(jié)果表明：Ti2AlNb基合金擴(kuò)散連接對(duì)連接溫度十分敏感，當(dāng)溫度為950 ℃時(shí)，合金的抗強(qiáng)度最大且拉伸斷口由大量等軸狀韌窩組成，具有典型的韌性斷裂特征；增大連接壓力有利于界面冶金結(jié)合，但實(shí)際中希望壓力盡可能小；保溫時(shí)間決定擴(kuò)散層深度，當(dāng)保溫時(shí)間為120 min時(shí)，擴(kuò)散層深度約為2 μm，連接面實(shí)現(xiàn)了良好的冶金結(jié)合。通過實(shí)驗(yàn)確定了較佳連接工藝規(guī)范為溫度950 ℃，壓力10~15 MPa，時(shí)間120 min。 附件:15-p0662-32099
關(guān)鍵字: 金屬間化合物；Ti2AlNb基合金；界面；擴(kuò)散連接
（1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. 306 Research Institute, The Third Research Academy of
China Aerospace Science and Industry Corporation, Beijing 100074, China）
Abstract:Ti2AlNb-based alloy diffusion bonding was prepared by the vacuum warm compaction diffusion method, the structures and performances of the bonding interfaces were analyzed by scanning electron microscope and tensile test. The results indicate that Ti2AlNb-based alloy diffusion bonding is sensitive to temperature, when temperature is 950 ℃, the tensile strength is the largest, and the tensile fracture is composed of a lot of toughening nests, which shows typical ductile fracture characteristics. Increasing connection pressure is beneficial to the metallurgical bonding interface, but in reality, low pressure is expected. The depth of diffusion layer is determined by heat preservation time, when the time is 120 min, the depth is about 2 μm, the junction surface achieves good metallurgical bonding. The better parameters are determined by experiment, which are temperature 950 ℃, pressures 10-15 MPa, time 120 min.
Key words: intermetallic compound; Ti2AlNb-based alloy; interface; diffusion bonding
