Effect of Cr Content on the Compression Properties and Abrasive Wear Behavior of the High-Volume Fraction (TiC-TiB2)/Cu Composites

doi:10.1007/s40195-014-0158-8

Abstract

Abstract:

The (TiC-TiB₂)/Cu composites with 50 vol% TiC-TiB₂ ceramic particles were successfully fabricated by the combustion synthesis and hot press consolidation in a Cu-Ti-B₄C-Cr system. The effects of the Cr content on the microstructures, hardness, compression properties, and abrasive wear behaviors of the composites were investigated. The final products consist of only Cu, TiC, and TiB₂ phases, and the ceramic particles are distributed uniformly in these composites. The size of the ceramic particles decreases with Cr addition. As the Cr content increases, the yield strength, ultimate compression strength, microhardness, and abrasive wear resistance of the composites increase, and the fracture strain decreases.

Key words: Metal matrix composites, Powder metallurgy, Combustion synthesis, Abrasive wear

Qiu Feng, Han Yue, Cheng Ai, Lu Jianbang, Jiang Qichuan. Effect of Cr Content on the Compression Properties and Abrasive Wear Behavior of the High-Volume Fraction (TiC-TiB₂)/Cu Composites[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(5): 951-956.

Figures/Tables 7

Fig. 1 XRD patterns of 50 vol% (TiC-TiB2)/Cu composites with different Cr additions: a 0 wt%; b 3 wt%; c 5 wt%; d 7 wt%

Fig. 2 SEM images of microstructures of 50 vol% (TiC-TiB2)/Cu composites with different Cr contents: a 0 wt%; b 3 wt%; c 5 wt%; d 7 wt%

Fig. 3 Compression engineering stress-strain curves of 50 vol% (TiC-TiB2)/Cu composites with different Cr contents

Table 1 Room-temperature compression properties and microhardness of 50 vol% (TiC-TiB2)/Cu composites with different Cr contents

Cr content (wt%)	σ _0.2 (MPa)	σ _UCS (MPa)	ε _f (%)	Hardness (HV)
0	\( 1 0 0 3_{ - 4 6}^{ + 3 3} \)	\( 1 2 5 2_{ - 5 4}^{ + 3 0} \)	\( 5. 8_{ - 0. 2}^{ + 0. 3} \)	404 ± 8
3	\( 1 1 1 3_{ - 4 3}^{ + 2 9} \)	\( 1 1 6 1_{ - 4 8}^{ + 3 5} \)	\( 2. 7_{ - 0. 3}^{ + 0. 2} \)	436 ± 8
5	\( 1 3 1 5_{ - 5 5}^{ + 4 6} \)	\( 1 3 5 8_{ - 4 5}^{ + 5 1} \)	\( 2. 3_{ - 0. 1}^{ + 0. 2} \)	491 ± 10
7	-	\( 1 8 2 7_{ - 5 2}^{ + 6 3} \)	\( 1. 9_{ - 0. 2}^{ + 0. 1} \)	543 ± 10

Fig. 4 SEM images of the compression fractured surfaces for 50 vol% (TiC-TiB2)/Cu composites with different Cr contents: a 0 wt%; b 3 wt%; c 5 wt%; d 7 wt%

Fig. 5 Wear rate versus applied load under the counterface of 45 μm Al2O3 abrasive particles for the pure copper and the (TiC-TiB2)/Cu composites with different Cr contents

Fig. 6 Worn surfaces of the pure copper a, 50 vol% (TiC-TiB2)/Cu composites without Cr addition b, with 3 wt% Cr c, 5 wt% Cr d, 7 wt% Cr e, f additions. The applied load is 15 N for a-e, and the applied load is 35 N for f

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Effect of Cr Content on the Compression Properties and Abrasive Wear Behavior of the High-Volume Fraction (TiC-TiB₂)/Cu Composites

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