Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg

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	Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg
	Liu, YJ; Liu, Z; Jiang, Y; Wang, GW; Yang, Y; Zhang, LC; Zhang, LC (reprint author), Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia.; Yang, Y (reprint author), Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Fujian, Peoples R China.
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2018-02-25
卷号	735 页码:1414-1421
关键词	Al-si Alloys Porous Structures Heat-treatment Fatigue Behavior Al-12si Alloy Ti-6al-4v Texture Composites Powder
ISSN号	0925-8388
英文摘要	It is known that metal parts can be made stronger, tougher and better wear resistance by introducing gradient microstructure. This work reports the cooling rate of melt pool induced discrepancy in microstructural gradient and element distribution during selective laser melting (SLM), thereby resulting in decrease in microhardness and wear resistance from surface to inside with a range of similar to 100 mu m of SLMmanufactured AlSi10Mg alloy. The cooling rate in the top surface of melt pool reaches similar to 1.44 x 10(6) K/s, which is much higher than that at the bottom (<= 1 x 10(3) K/s). Such a difference in cooling rate of melt pool is the main cause for forming gradient microstructure in terms of the distribution of Si particles, dendrite size, sub-grains and sub-boundaries. The variation in microstructure of SLM-produced AlSi10Mg alloy, as a result of gradient cooling rate, has a significant impact on its mechanical properties. Compared with core area, the surface area with a higher cooling rate is composed of finer Si particles, dendritic structure and more sub-boundaries, resulting in higher microhardness and greater wear resistance. The mechanism for formation of gradient microstructure and its influence on the mechanical properties are discussed, which provide new and deep insight into fabricating SLM-produced components with gradient microstructure. (C) 2017 Elsevier B.V. All rights reserved.; It is known that metal parts can be made stronger, tougher and better wear resistance by introducing gradient microstructure. This work reports the cooling rate of melt pool induced discrepancy in microstructural gradient and element distribution during selective laser melting (SLM), thereby resulting in decrease in microhardness and wear resistance from surface to inside with a range of similar to 100 mu m of SLMmanufactured AlSi10Mg alloy. The cooling rate in the top surface of melt pool reaches similar to 1.44 x 10(6) K/s, which is much higher than that at the bottom (<= 1 x 10(3) K/s). Such a difference in cooling rate of melt pool is the main cause for forming gradient microstructure in terms of the distribution of Si particles, dendrite size, sub-grains and sub-boundaries. The variation in microstructure of SLM-produced AlSi10Mg alloy, as a result of gradient cooling rate, has a significant impact on its mechanical properties. Compared with core area, the surface area with a higher cooling rate is composed of finer Si particles, dendritic structure and more sub-boundaries, resulting in higher microhardness and greater wear resistance. The mechanism for formation of gradient microstructure and its influence on the mechanical properties are discussed, which provide new and deep insight into fabricating SLM-produced components with gradient microstructure. (C) 2017 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	Shenzhen Fundamental Research [JCYJ 20160427170611414]; Australian Research Council [DP110101653]; ECU-PRS (International) Scholarship
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79489]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, LC (reprint author), Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia.; Yang, Y (reprint author), Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Fujian, Peoples R China.
推荐引用方式 GB/T 7714	Liu, YJ,Liu, Z,Jiang, Y,et al. Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,735:1414-1421.
APA	Liu, YJ.,Liu, Z.,Jiang, Y.,Wang, GW.,Yang, Y.,...&Yang, Y .(2018).Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg.JOURNAL OF ALLOYS AND COMPOUNDS,735,1414-1421.
MLA	Liu, YJ,et al."Gradient in microstructure and mechanical property of selective laser melted AlSi10Mg".JOURNAL OF ALLOYS AND COMPOUNDS 735(2018):1414-1421.