Ti6Al4V和Al12A12的擴散連接界面組織及力學性能

黃西娜; 郎利輝; 王剛; 段文

doi:10.13374/j.issn2095-9389.2017.07.008

Ti6Al4V和Al12A12的擴散連接界面組織及力學性能

doi: 10.13374/j.issn2095-9389.2017.07.008

北京航空航天大學機械工程及自動化學院, 北京 100191

詳細信息

中圖分類號: TG146.2
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出版歷程
- 收稿日期: 2016-11-10

Microstructure and mechanical properties of Ti6Al4V and Al12A12 diffusion bonding interface

School of Mechanical Engineeringand Automation, Beihang University, Beijing 100191, China

摘要

摘要: 采用熱等靜壓(HIP)工藝連接Al12A12和Ti6Al4V兩種不同的航空航天用材料.利用掃描電鏡、能譜儀和X射線衍射儀觀察連接過渡區的微觀組織和組成的演化,并測試其主要的力學性能.結果表明:采用熱等靜壓制備這兩種材料的界面連接好;Ti/Al反應層界面處形成了不同的金屬間化合物,例如,Al₃ Ti、TiAl₂和TiAl;連接接頭處硬度為163 HV,界面連接處剪切強度達到了23 MPa,比只添加鍍層而無中間層的連接強度提高了約17.9%,但低于帶有中間層的連接強度.由于過燒和孔隙的形成使得斷裂方式是脆性斷裂.由此可知,在熱等靜壓成形過程中異種材料的元素發生了相互擴散,在擴散連接處形成了不同的金屬間化合物,這些金屬間化合物影響連接處的力學性能.
- 熱等靜壓 /
- 擴散連接 /
- 微觀組織 /
- 剪切強度 /
- 硬度
Abstract: Hot isostatic pressing (HIP) was used to join two dissimilar aerospace alloys, namely Al12A12 and Ti6Al4V, for the first time. The microstructure and compositional evolutions were evaluated in the joint interface by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. The microhardness and shear strength tests were applied to study the mechanical properties of the joints. As a result, different intermetallic compounds (e. g., Al₃ Ti, TiAl₂, and TiAl) form in the reaction layer of Ti/Al. The findings show that the microhardness value of the joint region is 163 HV. The highest strength in the bonding zone is 23 MPa, which exhibites a 17.9% improvement compared to that only with Cu coating, but is lower than the bonding strength with the interlayer. The fracture mode is brittle fracture due to overburden and void formation. The elements of dissimilar materials diffuse into each other during the HIP. Furthermore, various intermetallic compounds form at the interface, which affects the mechanical properties of the joints.
- hot isostatic pressing /
- diffusion bonding /
- microstructure /
- shear strength /
- microhardness

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參考文獻(18)

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