Effect of Ti content on microstructure and properties of TixZrVNb refractory high-entropy alloys

• Published in: International journal of minerals, metallurgy and materials Vol. 27; no. 10; pp. 1318 - 1325
• Main Authors: Huang, Tian-dang, Wu, Shi-yu, Jiang, Hui, Lu, Yi-ping, Wang, Tong-min, Li, Ting-ju
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.10.2020; Springer Nature B.V; Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian Uni-versity of Technology, Dalian 116024, China%College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
• Subjects: Alloys; Casting alloys; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion and Coatings; Ductility; Entropy; Glass; High entropy alloys; High temperature; Materials Science; Mechanical properties; Metallic Materials; Microstructure; Natural Materials; Oxidation; Room temperature; Specific yield; Surfaces and Interfaces; Temperature; Thin Films; Titanium; Tribology; Yield strength; Yield stress; low density; elevated temperature; high-entropy alloys; mechanical properties
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-020-2040-1

This study aimed to investigate the microstructure and mechanical properties of Ti x ZrVNb ( x = 1, 1.5, 2) refractory high-entropy alloys at room and elevated temperatures. The TiZrVNb alloy consisted of the body-centered cubic (bcc) matrix with a small amount of V 2 Zr phase. The Ti 1.5 ZrVNb and Ti 2 ZrVNb alloys exhibited a single-phase bcc structure. At room temperature, the tensile ductility of the as-cast alloys increased from 3.5% to 12.3% with the increase in the Ti content. The Ti x ZrVNb alloys exhibited high yield strength at 600°C, and the ultimate yield strength was more than 900 MPa. Softening occurred at 800°C, but the ultimate yield strength could still exceed 200 MPa. Moreover, the Ti x ZrVNb alloys displayed low densities but high specific yield strengths (SYSs). The lowest density of Ti x ZrVNb alloys was only 6.12 g/cm 3 , but the SYS could reach about 180 MPa·cm 3 ·g −1 , which is better than those of most reported high-entropy alloys (HEAs).