Effect of Trace Boron Addition on the Microstructure and Tensile Elongation of Ti2AlNb-Based Orthorhombic Titanium Alloys

Masuo Hagiwara; Tomoyuki Kitaura

doi:10.4028/www.scientific.net/MSF.638-642.1439

Paper Titles

Study of Refined Microstructures after Two-Step Heat Treatments by Means of EBSD Technique on γ-TiAl Alloys
p.1416

An Investigation of Fracture Origins in Heat-Treated Ti₄₉Al₄₇Cr₂Nb₂ Powder Compacts
p.1422

Fe-6.5wt.%Si High Silicon Steel Sheets Produced by Cold Rolling
p.1428

Growth of Crystals and Formation of C40/C11_b Lamellar Structure in (Mo_0.85Nb_0.15)Si₂
p.1434

Effect of Trace Boron Addition on the Microstructure and Tensile Elongation of Ti₂AlNb-Based Orthorhombic Titanium Alloys
p.1439

DSC and Microstructural Investigations of the Elektron 21 Magnesium Alloy
p.1447

Creation of Fine Structure in Magnesium Alloys by Electromagnetic Vibration Process
p.1453

Effect of Cooling Rate on Morphology and Crystallography of Lath Martensite in Fe-Ni Alloys
p.1459

Corrosion Protection and Microstructure of Magnesium Alloys Anodized by Phosphate Solution
p.1464

HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Effect of Trace Boron Addition on the...

Effect of Trace Boron Addition on the Microstructure and Tensile Elongation of Ti₂AlNb-Based Orthorhombic Titanium Alloys

Abstract:

The grain sizes of two kinds of orthorhombic alloys, namely (O+B2) Ti-22Al-11Nb-2Mo -1Fe and (O+2) Ti-27.5Al-13Nb have been successfully reduced by the addition of trace boron (B) (less than 0.12 wt.%). For example, the grain size in the B2 solution-treated condition was reduced from 1 mm to 80 m by the addition of 0.05% B for both alloys. The tensile elongation of Ti-22Al-11Nb-2Mo-1Fe at room temperature and 650C was increased from 0.3% to 4.3%, and from 8.2% to 30.3%, respectively, by the addition of 0.10% B. Ti-27.5Al-13Nb also showed an improved room temperature ductility by the minor B addition.