Microstructure and Wear Behavior of In Situ ZA27/TiB2 Composites

Abstract

In situ ZA27/TiB2 composites were synthesized successfully by diluting the in situ Al/TiB2 composite, which was used as a master alloy. The microstructure and hardness of the developed in situ composites have been investigated. Results have shown that TiB2 particles distribute uniformly through the matrix and significantly refine the matrix grain. The hardness of the composites was higher than that of the matrix alloy and increased with the increasing TiB2 content. The dry sliding wear behavior under heavy loads and high rotation speed were studied in detail by using a pin-on-disc wear tester at room temperature. The results revealed that the wear resistance of the composites increased monotonically with the increase in the TiB2 content. The composites had a lower coefficient of friction, friction temperature, wear rate, and specific wear rate especially under high loads when compared with the matrix alloy. An increase in the applied load increased the wear severity by changing the wear mechanism from abrasion and oxidation to adhesive wear. The composites possess better adhesive wear resistance properties compared with the matrix, which shows obvious adhesive wear as the load increased to 36 N, while the ZA27/3.0% TiB2 composite did not show adhesive wear until the load increased to 54 N.

High‐Stress Abrasive Wear Analysis of in Situ TiC‐Reinforced Zinc–Aluminum Composites Using Integrated Taguchi–TOPSIS Method

“…To overcome such limitations, hard second-phase particles, such as ceramics, are often reinforced to form composites. Various ceramic reinforcements added to these alloys are Al 2 O 3 , [2,3] SiC, [4][5][6][7] TiC, [8][9][10][11][12][13] TiB 2 , [14] B 4 C, [15] MoS 2 , [16] etc.…”

Tribological behaviour of lamb bone ash and boron carbide reinforced ZA-27 hybrid metal matrix composites under dry sliding conditions

“…Therefore, to overcome such limitations, the ZA-27 alloy is being reinforced with second phase thermally stable ceramic reinforcements to enhance mechanical and tribological properties [6]. Hard ceramic reinforcement particles like SiC, TiB 2 , TiC, Al 2 O 3 , and zircon, when added in ZA-27 alloy was reported to improve the sliding and abrasion wear resistance, thereby increasing its application as lightweight and wear resistance materials [7][8][9][10][11]. Nowadays, hybrid metal matrix composites (HMMCs) are gaining more importance than single reinforced composites.…”