Microstructure and mechanical properties of a novel near-α titanium alloy Ti6.0Al4.5Cr1.5Mn

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 672; pp. 170 - 174
• Main Authors: Wang, Hong-bin, Wang, Shu-sen, Gao, Peng-yue, Jiang, Tao, Lu, Xiong-gang, Li, Chong-he
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.08.2016
• Subjects: Alloy systems; Data base management systems; Elongation; Laves phase; Mechanical properties; Microstructure; Microstructure and performance; Near-α titanium alloy; Titanium base alloys; Water-cooled copper crucible; Near-α titanium alloy; Water-cooled copper crucible; Microstructure and performance; Laves phase
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2016.06.083

Based on previous Ti-Al-Cr-Mn quaternary system thermodynamic database, a novel near-α titanium alloy Ti-6.0Al-4.5Cr-1.5Mn alloy was designed and successfully prepared by the water-cooled copper crucible. Microscopic observation showed that both as-cast and annealing status consist of α phase, which coincides with the theoretical expectation. The mechanical properties at room temperature were measured and this alloy possesses good mechanical properties, its average yield-strength reaches 1051.5MPa and tensile-strength is up to 1091.2MPa while its average elongation is just 8.3%. Compared with the TA15, it has better mechanical strength and worse elongation. In the new alloy Laves phase Cr2Ti were detected by XRD pattern and TEM, which may cause the alloy's poor plasticity.