Crystallization Behavior of a Ti-Zr Alloy with GH4169 Alloy Powder as an Additive Prepared via Low-Temperature Liquid-Phase Spark Plasma Sintering

Ti-Zr alloy blanks were successfully prepared by low-temperature liquid-phase sintering at 1000 degrees C using GH4169 alloy powder as an additive. Then, the crystallization and organization evolution laws of Ti-Zr alloy under different holding time conditions during the sintering process were studied in detail. Research shows that, when the holding time reached 30 min, the sintered alloy contained alpha-phase, beta-phase, and titanium oxide phases. The average grain sizes of the alpha-phases and beta-phases matrix are in the ranges of 100 to 300 nm and 50 to 80 mu m, respectively. However, when the holding time was less than 20 min, the temperature gradient dropped greatly due to an instantaneous power failure during the spark plasma sintering process, which made it too late for the liquid phase at the grain boundaries to crystallize and caused the amorphous phase to form between them. Subsequently, the alpha-transition phase first precipitated and then, transformed into the beta-phase. The alpha-transition phase mainly precipitated in the (12 (3) over bar5) [5 (5) over bar 01[ orientation, while the beta-phase mainly precipitated in the (11 (4) over bar) [1 (1) over bar0] and (161) < 4 (1) over bar2 > orientations, with the preferred orientation being (114) [1 (1) over bar0].