Microstructure and mechanical properties at TiCp/Ni-alloy interfaces in laser-synthesized coatings

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	Microstructure and mechanical properties at TiCp/Ni-alloy interfaces in laser-synthesized coatings
	Wu XL(武晓雷); Hong YS(洪友士)
刊名	Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
	2001
卷号	318 期号:1-2 页码:15-21
ISSN号	0921-5093
通讯作者	Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 ZhongGuanCun Rd, Beijing 100080, Peoples R China.
中文摘要	Titanium carbide particle (TiCp) reinforced Ni alloy composite coatings were synthesized by laser cladding using a cw 3 kW CO2 laser. Two kinds of coatings were present in terms of TiCp origins, i.e. undissolved and in situ reacted TiCp, respectively. The former came from the TiCp pre-coated on the sample, whereas the latter from in situ reaction between titanium and graphite in the molten pool during laser irradiation. Conventional and high-resolution transmission electron microscope observations showed the epitaxial growth of TiC, the precipitation of CrB, and the chemical reaction between Ti and B elements around phase interfaces of undissolved TiCp. The hardness, H, and elastic modulus, E, were measured by nanoindentation of the matrix near the TiCp interface. For undissolved TiCp, the loading curve revealed pop-in phenomena caused by the plastic deformation of the crack formation or debounding of TiCp from the matrix. As for in situ generated TiCp, no pop-in mark appears. On the other hand, in situ reacted TiCp led to much higher hardness and modulus than that in the case of undissolved TiCp. The coating reinforced by in situ generated TiCp displayed the highest impact wear resistance at both low and high impact conditions, as compared with coatings with undissolved TiCp and without TiCp. The impact wear resistance of the coating reinforced by undissolved TiCp increases at a low impact work but decreases at a high impact work, as compared with the single Ni alloy coating. The degree of wear for the composite coating depends primarily on the debonding removal of TiCp.
学科主题	力学
类目[WOS]	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
研究领域[WOS]	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
关键词[WOS]	WEAR ; HARDNESS
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000173196700002
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/17127]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Wu XL,Hong YS. Microstructure and mechanical properties at TiCp/Ni-alloy interfaces in laser-synthesized coatings[J]. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,2001,318(1-2):15-21.
APA	武晓雷,&洪友士.(2001).Microstructure and mechanical properties at TiCp/Ni-alloy interfaces in laser-synthesized coatings.Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,318(1-2),15-21.
MLA	武晓雷,et al."Microstructure and mechanical properties at TiCp/Ni-alloy interfaces in laser-synthesized coatings".Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 318.1-2(2001):15-21.