Microstructure and property of sub-micro WC-10%Co particulate reinforced Cu matrix composites prepared by selective laser sintering

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	Microstructure and property of sub-micro WC-10%Co particulate reinforced Cu matrix composites prepared by selective laser sintering
	D. D. Gu; Y. F. Shen; P. Dai; M. C. Yang
	2006
发表期刊	Transactions of Nonferrous Metals Society of China
ISSN	1003-6326
卷号	16 期号:2 页码:357-362
摘要	The WC-10%Co particulate reinforced Cu matrix composite material with a WC-Co : Cu mass ratio of 20 : 80 was successfully fabricated by selective laser sintering(SLS) process. The following optimal processing parameters were used: laser power of 700 W, scan speed of 0.06 m/s, scan line spacing of 0.15 mm, and powder layer thickness of 0.3 mm. The microstructure, composition, and phase of the laser processed material were investigated by scanning electron microscopy(SEM), X-ray diffraction(XRD), and energy dispersive X-ray(EDX) spectroscopy. The results show that the bonding mechanism of this process is liquid phase sintering. The Cu and Co act as the binder phase, while the WC acts as the reinforcing phase. The non-equilibrium effects induced by laser melting, such as high degrees of undercooling and high solidification rate, result in the formation of a metastable phase CoC0.25. The WC reinforcing particulates typically have three kinds of morphology. They are agglomerated and undissolved, incompletely separated and partially dissolved, separated and dissolved, which indicates that particle rearrangement acts as the dominant sintering mechanism for the larger WC, while dissolution-precipitation prevails for the smaller WC particles. Microhardness tester was used to determine the Vickers hardness across the cross-section of the laser sintered sample, with the average value being HV(0.1)268.5. However, the hardness varied considerably, which might be attributed to the WC segregation and the high solidification rate experienced by the molten pool.
部门归属	nanjing univ aeronaut & astronaut, coll mat sci & technol, nanjing 210016, peoples r china. chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china.;shen, yf (reprint author), nanjing univ aeronaut & astronaut, coll mat sci & technol, nanjing 210016, peoples r china;yifushen@nuaa.edu.cn
关键词	Selective Laser Sintering Metal Matrix Composites Cu Matrix Composite Wc-co Cu Microstructure Microhardness Wc-co Metal Powders Densification Alloy Parts
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WOS记录号	WOS:000237339000021
引用统计	被引频次：25[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34220
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. D. Gu,Y. F. Shen,P. Dai,et al. Microstructure and property of sub-micro WC-10%Co particulate reinforced Cu matrix composites prepared by selective laser sintering[J]. Transactions of Nonferrous Metals Society of China,2006,16(2):357-362.
APA	D. D. Gu,Y. F. Shen,P. Dai,&M. C. Yang.(2006).Microstructure and property of sub-micro WC-10%Co particulate reinforced Cu matrix composites prepared by selective laser sintering.Transactions of Nonferrous Metals Society of China,16(2),357-362.
MLA	D. D. Gu,et al."Microstructure and property of sub-micro WC-10%Co particulate reinforced Cu matrix composites prepared by selective laser sintering".Transactions of Nonferrous Metals Society of China 16.2(2006):357-362.