Bimodal microstructure dispersed with nanosized precipitates makes strong aluminum alloy with large ductility | |
Zhang, Xuezheng; Chen, Tijun | |
刊名 | Materials and Design |
2020-06-01 | |
卷号 | 191 |
关键词 | Ductility Economic and social effects Microstructure Precipitation (chemical) Tensile strength 6061 aluminum alloys Aging treatment Artificial aging treatments Bi-modal microstructures Deformation incompatibilities Geometrically necessary dislocations Precipitate strengthening Trade off |
ISSN号 | 02641275 |
DOI | 10.1016/j.matdes.2020.108695 |
英文摘要 | A bimodal microstructure composed of large primary α-Al phases (PPs) and small secondarily solidified grains (SSGs) is fabricated in 6061 aluminum alloy by powder thixoforming (PTF) method after solution treatment. Artificial aging treatment introduces nanosized precipitates into the bimodal microstructure, in which the number and growth rate of precipitates are different: the number in PPs is larger than that in SSGs due to the higher density of dislocations and lattice distortions in PPs, while the growth rate in SSGs is higher than that in PPs owing to the higher solute concentration in SSGs. As the number and size of precipitates are optimized in the bimodal microstructure, i.e., in peak-aged state, remarkable increments of 56.1% and 130.3% in ultimate tensile strength and yield strength while a moderate increase of 6.3% in ductility are achieved compared with the as-fabricated state, which overcomes the trade-off in strength and ductility of conventional aging-treated 6061 alloys with unimodal microstructure. The strengthening comes from the geometrically necessary dislocations induced by the deformation incompatibility of bimodal microstructure and from precipitate strengthening by nanosized precipitates, while the toughening is from the enhanced dislocation accumulation in this alloy. © 2020 The Authors |
WOS研究方向 | Materials Science |
语种 | 英语 |
出版者 | Elsevier Ltd |
WOS记录号 | WOS:000536937200086 |
内容类型 | 期刊论文 |
源URL | [http://ir.lut.edu.cn/handle/2XXMBERH/115103] |
专题 | 材料科学与工程学院 |
作者单位 | State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China |
推荐引用方式 GB/T 7714 | Zhang, Xuezheng,Chen, Tijun. Bimodal microstructure dispersed with nanosized precipitates makes strong aluminum alloy with large ductility[J]. Materials and Design,2020,191. |
APA | Zhang, Xuezheng,&Chen, Tijun.(2020).Bimodal microstructure dispersed with nanosized precipitates makes strong aluminum alloy with large ductility.Materials and Design,191. |
MLA | Zhang, Xuezheng,et al."Bimodal microstructure dispersed with nanosized precipitates makes strong aluminum alloy with large ductility".Materials and Design 191(2020). |
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