title: Time-of-flight atom probe measurements on Ni3Al and Co3W.
abstract: In this study, a VG FIM100 was taken into operation, consisting of a field-ion microscope (FIM), a time-of-flight atom probe (TOFAP) and an imaging atom probe. A tungsten specimen was used to calibrate the conversion of flight times to m/n values. The resulting relative mass resolution of the TOFAP was calculated to be m/Deltam approximately 500 FWHM. In time-of-flight measurements of homemade boron-doped Ni-rich Ni(3)Al, a so-called ladder diagram was constructed from the evaporation data of a <001> pole. This ladder diagram revealed a very high degree of ordering in the alternating pure Ni and mixed Ni/Al planes: only 0.4% of the detected Al atoms were located on pure Ni planes. The number of null pulses to start a new plane was found to be much higher for Ni/Al planes (5 x 10(2)) than for Ni planes (1 x 10(2)). Moreover, the ladder diagram showed that boron was uniformly distributed through the matrix with nearly all boron found on pure Ni-planes. The suggestion that boron preferentially settles on these planes would be supported by reports of a strong Ni-B bond, since on Ni planes, B atoms can be accommodated on octahedral interstitial sites surrounded by only Ni atoms. Finally, we performed time-of-flight measurements on Co(3)W. The ion species observed in these measurements included a wide variety of WN(n)(2+) ions, with 0</=n</=9. Especially, the ions with odd n prevailed in this ion group.
authors.affiliation: Department of Applied Physics, Materials Science Center, Netherlands Institute for Metals Research, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands.
authors.forename: W A
authors.initials: WA
authors.lastname: Soer
authors.forename: P M
authors.initials: PM
authors.lastname: Bronsveld
authors.forename: J Th M
authors.initials: JT
authors.lastname: De Hosson