Additive Manufacturing of γ‐TiAl: Processing, Microstructure, and Properties

Abstract

Additive manufacturing of g-TiAl intermetallic alloy using laser-engineered net shaping (LENS) is reported. The influence of laser power and scan speed on processability, microstructure, tribological, and electrochemical properties is studied. The results demonstrate that near net shape g-TiAl parts can be fabricated using LENS and defect-free parts are obtained with narrow laser energy input range (40-50 J mm À2 ). The high cooling rates result in massive-like g matrix with small amount of g þ a 2 lamellar. Process parameters strongly influence tribological and electrochemical properties of LENS-processed g-TiAl parts in 3.5% NaCl solution. Wear is of abrasive type with no evidence of corrosion on wear tracks.

Hydrogen‐Induced Improvement of the Cylindrical Drawing Properties of a Ti–22Al–25Nb Alloy

“…The dispersion strengthening effect was weaker than that of the 0H alloy. 2) The cylindrical drawing-forming ability of the alloy increased significantly after adding 0.2 wt% H to the alloy. When the drawing coefficient was 0.33, the punch displacement when the 0.2H alloy fractured increased by approximately 34% compared to the punch displacement when the 0H alloy fractured.…”

“…Ti 2 AlNb-based alloys have favorable specific strength, specific stiffness, corrosion resistance, [1][2][3][4] and high-temperature mechanical properties and are currently one of the most promising materials to replace nickel (Ni)-based alloys, especially in aircraft engine discs and blades. [5,6] The Ti-22Al-25Nb alloy is a second-generation Ti 2 AlNbbased alloy that offers better mechanical properties.…”

Continuous Casting of TiAlNb Alloys with Different Velocities by Mixing Binary TiAl Ingot and Nb Wire

“…[1][2][3] On the other hand, the lack of ductility and toughness at room temperature affects the mechanical property. [1][2][3] On the other hand, the lack of ductility and toughness at room temperature affects the mechanical property.…”

“…TiAl-based alloys use in the aerospace and automotive industries for high-temperature applications due to their attractive properties such as low density, high specific stiffness, good oxidation resistance, and good creep properties at high temperature. [1][2][3] On the other hand, the lack of ductility and toughness at room temperature affects the mechanical property. [4,5] In the past research, alloying element addition and heat treatment of alloys are paid a lot of attention.…”

Creep Behavior of High‐Nb TiAl Alloy at 800–900 °C by Directional Solidification

“…Titanium aluminum alloy based on the intermetallic gamma phase has been considered as lightweight materials for high‐temperature applications in the aerospace and automotive industries, which may replace the high‐density nickel‐base superalloys at intended service temperature of 600–900 ° C . The appropriate additions of metallic (Nb, Cr, V, Mn) alloying elements in TiAl‐based alloys can further improve the mechanical properties, creep resistance, and oxidation resistance by solid solution and precipitation hardening .…”