Effect of Cooling Rate on Microstructure and Properties ofa Cu-Containing Titanium Alloy

doi:10.11900/0412.1961.2017.00267

Acta Metall Sin

2017, Vol. 53

Issue (10): 1377-1384 DOI: 10.11900/0412.1961.2017.00267

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Effect of Cooling Rate on Microstructure and Properties ofa Cu-Containing Titanium Alloy

Cong PENG^1,², Shuyuan ZHANG¹, Ling REN¹(

), Ke YANG¹

1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

Cong PENG, Shuyuan ZHANG, Ling REN, Ke YANG. Effect of Cooling Rate on Microstructure and Properties ofa Cu-Containing Titanium Alloy. Acta Metall Sin, 2017, 53(10): 1377-1384.

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Abstract

The Cu-containing titanium alloy has been proved to possess excellent antibacterial performance, which has great potential for clinical application. In this work, the effect of cooling rate on the microstructure, mechanical properties, corrosion resistance and antibacterial property of a Ti6Al4V-5Cu alloy was investigated. Results showed that the furnace-cooled alloy exhibited the best ductility because of the maximum size and volume fraction of the primary α phase in microstructure. The alloys water quenched from 740 and 820 ℃ respectively demonstrated low hardness and yield strength due to the existence of orthorhombic α′′ phase in microstructure. The alloy quenched at 910 ℃ showed the highest hardness and tensile strength, but the lowest plasticity because of the presence of acicular hcp α′ phase. With the increase of heating temperature, the elemental distribution in the alloy became more uniform, and therefore the corrosion resistance increased gradually. However, the cooling rate did not obviously change the antibacterial property of the alloy. The Ti6Al4V-5Cu alloy showed excellent antibacterial property under different cooling rates.

Key words: Cu-containing titanium alloy microstructure mechanical property corrosion resistance antibacterial property

Received: 03 July 2017

ZTFLH:

R318.08

Fund: Supported by National Natural Science Foundation of China (No.51631009), National Key Research and Development Program of China (No.2016YFC1100600), Youth Innovation Promotion Association, CAS (No.2014168), Natural Science Foundation of Guangdong Province (No.2015A030312004), and Joint Foundation of Natural Science Foundation of Liaoning Province and Shenyang National Laboratory for Materials Science (No.2015021004)

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	Cong PENG
	Shuyuan ZHANG
	Ling REN
	Ke YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00267 OR https://www.ams.org.cn/EN/Y2017/V53/I10/1377

Fig.1 XRD spectra of Ti6Al4V-5Cu alloy sample
(a) air cooling (AC) and furnace cooling (FC)
(b) water quenching (WQ)

Fig.2 SEM images of Ti6Al4V-5Cu alloy sample
(a) 740FC (b) 740AC (c) 740WQ (d) 820WQ (e) 910WQ

Fig.3 TEM images and EDS analysis of Ti6Al4V-5Cu alloy samples
(a) 740AC (b) 740WQ (c) 910WQ (d) EDS of 740AC

Fig.4 Effects of cooling rate for Ti6Al4V-5Cu alloy on Vickers hardness (a), tensile properties (b) and corrosion resistance (c) (E_corr—corrosion potential, i_corr—corrosion current density)

Fig.5 Typical photographs (a) and antibacterial rates (b) of S. aureus colonization after 24 h cultures of Ti6Al4V-5Cu alloy samples

Fig.6 Typical 3D photographs (a) and thickness (b) of S. aureus biofilms incubated on the surfaces of Ti6Al4V-5Cu alloy samples for 24 h co-culture (*p<0.05 when compared to Ti6Al4V alloy)

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