Fabrication and Mechanical Properties of Ti-Reinforced Cu40Zn Brass Alloy via Powder Metallurgy

doi:10.11901/1005.3093.2019.484

Chinese Journal of Materials Research

2020, Vol. 34

Issue (2): 101-108 DOI: 10.11901/1005.3093.2019.484

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Fabrication and Mechanical Properties of Ti-Reinforced Cu40Zn Brass Alloy via Powder Metallurgy

MA Chen,ZHANG Xin,PAN Deng,ZHENG Feiyang,LI Shufeng(

)

School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

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MA Chen,ZHANG Xin,PAN Deng,ZHENG Feiyang,LI Shufeng. Fabrication and Mechanical Properties of Ti-Reinforced Cu40Zn Brass Alloy via Powder Metallurgy. Chinese Journal of Materials Research, 2020, 34(2): 101-108.

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Abstract

High strength Ti-reinforced Cu40Zn brass alloy was prepared by powder metallurgy. The effect of Ti addition on the microstructure, interfacial structure, phase composition and mechanical properties of the brass was investigated. Results show that Ti exists in Cu40Zn matrix as sub-micron Cu₂Ti₄O particles and Ti nanoclusters, which can significantly improve the mechanical properties of Cu40Zn by means of second-phase strengthening, fine-grain strengthening and processing hardening. Cu40Zn-1.9Ti has good comprehensive performance: the yield strength, tensile strength, elongation at break and hardness are 375 MPa, 602 MPa, 17.7% and 163 HV respectively.

Key words: metallic materials powder metallurgy brass alloy titanium mechanical properties nano precipitates

Received: 16 October 2019

ZTFLH:

TG146.1

Fund: National Natural Science Foundation of China(51571160);National Natural Science Foundation of China(51871180);Natural Science Basic Research Plan in Shaanxi Province(2015JM5233);Xi'an Science and Technology Project(201805037-YD15CG21(15));Xi'an University of Technology Doctoral Dissertation Innovation Fund(310-252071903)

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	Chen MA
	Xin ZHANG
	Deng PAN
	Feiyang ZHENG
	Shufeng LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.484 OR https://www.cjmr.org/EN/Y2020/V34/I2/101

Fig.1 Diagram of the preparation process of Ti reinforced Cu40Zn specimens (unit: mm)

Fig.2 Morphologies of raw materials and corresponding elements distribution (a) raw Cu40Zn powders, (b) raw Ti powders， (c) Cu40Zn-0.7Ti powder mixtures, (d~f) elements distribution of Cu, Zn and Ti corresponding to Fig.2c

Fig.3 XRD patterns of Cu40Zn-xTi (a) powder mixtures; (b) as-extruded samples

Fig.4 Optical images of longitudinal cross-section of Cu40Zn brass with different Ti addition after hot extrusion (a) Cu40Zn, (b) Cu40Zn-0.3Ti, (c) Cu40Zn-1.1Ti, (d) Cu40Zn-1.9Ti

Fig.5 SEM micrographs of longitudinal and transversal cross-section of Cu40Zn brass with different Ti addition after hot extrusion (a, a') Cu40Zn; (b, b') Cu40Zn-0.3Ti; (c, c') Cu40Zn-1.1Ti; (d, d') Cu40Zn-1.9Ti

Fig.6 EDS mappings of Cu40Zn-0.7Ti longitudinal to extrusion direction (a) SEM image of Cu40Zn-0.7Ti after extrusion; (b~d) distribution of Ti, Cu and Zn elements corresponding to Fig.6a

Fig.7 TEM micrographs of Cu40Zn-1.9Ti (a, b) bright field image; (c) selected area electron diffraction pattern corresponding to diff.1 remarked in Fig.7b; (d, e) high resolution TEM images corresponding to area HR1 and HR2 in Fig.7b; (f) diffraction fringe corresponding to area A3 in Fig.7b

Fig.8 Stress-strain curves of Cu40Zn brass with different Ti additives

Table 1 Mechanical properties of Cu40Zn brass with different Ti additives

Fig.9 Relationship between the amount of titanium addition and the mechanical properties and hardness of titanium brass

Fig.10 Fracture micrographs of Cu40Zn-Ti with different Ti additions (a, a') Cu40Zn; (b, b') Cu40Zn-0.3Ti; (c, c') Cu40Zn-1.1Ti; (d, d') Cu40Zn-1.9Ti

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