Effect of Forging Temperature on Microstructure and Mechanical Properties of <I>In Situ</I> (TiB+TiC)/Ti Composites

Abstract

In this paper, 5 vol% (TiB+TiC)/Ti-1100(Ti-6Al-2.75Sn-4Zr-0.4Mo-0.45Si) composite were fabricated using in situ technologies between Ti and B 4 C powders. Phase identification was carried out by X-ray diffraction. transus temperature of the composite was measured by metallographic techniques. The composite after ingot breakdown was forged in various temperature ranges. Microstructure of the composite after forging at various temperatures was studied by optical microscopy (OM). Mechanical properties of the composite after forging at various temperatures were evaluated by tensile tests at 873 K. It was found that the transus temperature of the composites was around 100 K higher than that of monolithic Ti-1100 alloy. Different microstructures were obtained after forging at different temperatures. The composite with different microstructures offered different mechanical properties, which was shown in the tensile tests.

Microstructure Characteristics and Mechanical Properties of <i>In Situ</i> TiB/Ti Composites Prepared by Arc-Melting Technique

“…Feng-cang Ma et. [25] have studied the effect of forging temperature on microstructure and mechanical properties of in situ 5vol% (TiB+TiC)/Ti-1100 composites. In this study, TiB reinforced Ti-3Al, Ti-6Al and Ti-6Al-4V matrix composites have been prepared by melting technique, and then forged in the α+β phase field.…”

Mechanical Properties and Strengthening Mechanisms of <i>In Situ</i> (TiB+TiC)/Ti-1100 Composite at Elevated Temperature

“…These composites produced via in situ techniques exhibit high specific strength and modulus, as well as excellent creep resistance. Among the candidate reinforcements produced via in situ techniques, TiB and TiC are favorable for some characters, such as: high elastic modulus, low cost and ease of fabrication utilizing the reaction between Ti and C or B 4 C. Previous researches have reported preferable mechanical properties of TMCs reinforced with TiC or (TiB+TiC) particles [4][5][6][7]. On the other hand, it is well understood that the mechanical properties of the TMCs reinforced with ceramic particles are depended not only on the matrix but also on the ceramic particles.…”

Effect of TiB Whiskers Orientation on Mechanical Properties in an <I>In Situ</I> TiB/Ti-1100 Composite

“…Among the candidate reinforcements produced via in situ techniques, TiB is favorable for some characters, such as: high elastic modulus, whisker-like crystal growth and ease of fabrication utilizing the reaction between Ti and B or B 4 C. Previous researches have reported preferable mechanical properties of TMCs reinforced with TiB whiskers. [4][5][6][7] On the other hand, it is well understood that the mechanical properties of the TMCs reinforced with TiB whiskers anisotropic if TiB whiskers are aligned. S. Gorsse reported the different mechanical properties of TiB/Ti-6Al-4V composite with randomly or aligned oriented TiB reinforcements.…”