EFFECT OF SURFACE ALUMINIZING ON LONG-TERM HIGH-TEMPERATURE THERMAL STABILITY OF TC4 TITANIUM ALLOY

Abstract

Aluminum (Al)–rich titanium (Ti)–Al alloyed coating was fabricated on the surface of TC4 Ti alloy to improve the high-temperature stability of TC4 Ti alloy by means of arc-added glow discharge plasma technology. Microstructure, room-temperature properties and long-term high-temperature oxidation behavior of the alloyed sample were investigated. The results show that a uniform and compact Ti–Al alloyed coating with about 30[Formula: see text][Formula: see text]m thickness formed on the surface of TC4 Ti alloy. Microhardness and room-temperature wear resistance of the alloyed sample improved significantly. Long-term oxidation behaviors of the samples in air at 800[Formula: see text]C for 1000[Formula: see text]h show that the mass gain of the alloyed sample was 0.3686[Formula: see text]mg/cm2, while that of the substrate was 18.2095[Formula: see text]mg/cm2. Arc-added glow discharge plasma aluminizing improved high-temperature oxidation resistance of TC4 Ti alloy significantly.