Core/shell volume effect on the microstructure and mechanical properties of fibrous Al2O3–(m-ZrO2)/t-ZrO2 composite

✍ Scribed by Byong Taek Lee; Swapan Kumar Sarkar; Asit Kumar Gain; Soo-Jae Yim; Ho Yeon Song

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 935 KB
• Volume: 432
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.06.058

✦ Synopsis

Al 2 O 3 -(monoclinic-ZrO 2 )/tetragonal-ZrO 2 composites (Al 2 O 3 -(m-ZrO 2 )/t-ZrO 2 ) were fabricated by the multi-pass extrusion process to introduce continuously fibrous textures with different core/shell volume fractions of Al 2 O 3 -(m-ZrO 2 ) and t-ZrO 2 (60/40, 50/50, 40/60, 30/70 and 20/80). The values of the bending strength and fracture toughness increased as the t-ZrO 2 shell volume fraction increased, with maximum values of 1031 MPa and 8.1 MPa m 1/2 in the 20 (core)/80 (shell) composite, respectively. However, the Vickers hardness value decreased as the core volume fraction decreased due to the increase of t-ZrO 2 content.