| 1 | Effects of Nb content in Ti–Ni–Nb brazing alloys on the microstructure and mechanical properties of Ti–22Al–25Nb alloy brazed joints显示文摘Vacuum brazing was successfully used to join Ti–22Al–25Nb alloy using Ti–Ni–Nb brazing alloys prepared by arc-melting. The influence of Nb content in the Ti–Ni–Nb brazing alloys on the interfacial microstructure and mechanical properties of the brazed joints was investigated. The results showed that the interfacial microstructure of brazed joint consisted of B2, O, ?3, and Ti2 Ni phase, while the width of brazing seams varied at different Nb contents. The room temperature shear strength reached359 MPa when the joints were brazed with eutectic Ti40Ni40Nb20 alloy at 1180?C for 20 min, and it was321, 308 and 256 MPa at 500, 650 and 800?C, respectively. Cracks primarily initiated and propagated in ?3compounds, and partially traversed B2+O region. Moreover, the fracture surface displayed typical ductile dimples when cracks propagated through B2+O region, which was favorable for the mechanical properties of the brazed joint. | Y.Wang X.Q.Cai Z.W.Yang D.P.Wang X.G.Liu Y.C.Liu | 2017 | Journal of Materials Science & Technology2017，33，7： | 5 |
| 7 | 减小U形回弹的“双弯”技术显示文摘由于受前道工序和回弹的影响,U形件弯曲的直边部分往往出现倾斜。但是,假如将预成形的U形件展平,然后在另一个新的位置重新弯曲,采用“双弯”技木,那直边的倾斜即可减小。基于这个简单的几何原理,五种实用操作方法,其中有三种整形方法和两种成形方法已经发展起来。并经试验验证,能有效地降低直边的倾斜度,即减小U形件的回弹。在某些特殊情况下。由于双弯技术影响回弹的工艺发生变化,与实际应用刚好相反。 | Y.C.LIU 倪锋 于根平 | 1989 | 模具技术1989，，5： | 0 |
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