Yaoxiao Zhu

Incoloy 901 alloy with improved malleability

Abstract The study of the solidification process reveals that the high phosphorus and boron contents in commercial Incoloy 901 alloy lead to its low incipient melting temperature, which limits the starting forging temperature to a lower level because of the formation of a low melting point structure containing extremely high phosphorus and boron contents. By reducing and properly controlling their contents, the starting forging temperature of Incoloy 901 alloy can be raised to 1220 °C from 1140 °C without sacrificing mechanical properties, which will greatly lower the resistance to deformation and favour the forging process.

Growth and holography application of Fe-doped LiNbO3 single crystals

Abstract Single crystal growth and holography application of Fe-LiNbO3 were investigated. The Fe-LiNbO3 crystals were grown from the melt of congruent composition along the c-axis by the Czochralski technique. Its maximum defraction efficiency was greater than 80%; besides a write-in Fourier transform hologram, a reflection hologram was also successfully recorded in the crystal. The hologram for nondestructive testing and heat-motion field display showed quite good results. In our experiment, a He-Ne laser could also be used to record the hologram.

Effect of boron and zirconium on directional solidification behaviour and segregation of DS IN738 superalloy

The effect of boron and zirconium on the directional solidification behaviour and segregation of IN738 superalloy has been studied. It was found that additions of boron and zirconium enlarge the solidus-liquidus temperature interval and increase the amount of residual melt during solidification. Boron gives the alloy a tendency to form developed dendrites, while zirconium enhances a cellular solidified structure. Both boron and zirconium are shown to be rejected to the residual melt during solidification, and shown to change the segregation of alloying elements by interaction.

Holographic properties and applications of electro-optical crystals

The holographic properties and applications of LiNbO3: Fe and BaxSr1−xNb2O6: Ce were investigated. For a diffraction efficiency of 10% exposure levels of 200 and 20 mj/cm2 are required respectively. The maximum diffraction efficiency is more than 80%.