Influence of Aging Temperatures on Precipitation Behaviors of SiC/Al-Zn-Mg-Cu Composites

doi:10.11900/0412.1961.2024.00060

IMR OpenIR

	Influence of Aging Temperatures on Precipitation Behaviors of SiC/Al-Zn-Mg-Cu Composites
	Zhang Ran 1,2,3; Zhu Shize 1; Liu Zhenyu 1; Ke Yubin 3,4; Wang Dong 1; Xiao Bolv 1; Ma Zongyi 1
通讯作者	Zhu Shize(szzhu16s@imr.ac.cn) ; Ke Yubin(keyb@ihep.ac.cn)
	2024-08-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	60 期号:8 页码:1043-1054
摘要	A comprehensive understanding of how the addition of SiC particles influences the precipitation-strengthening behaviors of SiC/Al-Zn-Mg-Cu composites is essential for the advancement of high-performance aluminum matrix composites. However, the intrinsic mechanisms have remained unclear for a long time owing to limited characterization methods. Herein, the effect of aging temperatures (100 and 160 degrees C) on the precipitation behaviors and strengthening mechanisms of SiC/Al-7.5Zn-1.8Mg1.7Cu (mass fraction, %) composites containing 15%SiC (volume fraction) was investigated using in situ small angle neutron scattering, transmission electron microscopy, and tensile testing. A comparison was also made with the Al-7.5Zn-1.8Mg-1.7Cu alloy. As the aging time extended from 0.5 h to 3 h at 100 degrees C, the precipitates in the composites evolved from GPI zones to GPI zones + GPII zones, accompanied by a noticeable increase in size. However, the increase in the volume fraction of precipitates was not substantial owing to slow aging kinetics. This increase in both the size and volume fraction of precipitates can enhance the resistance to dislocation cutting through precipitates, thereby improving the precipitation-strengthening capacity of the composites. Aging kinetics accelerated at 160oC, leading to an increase in both the size and volume fraction of precipitates in the composites with extended aging time. The types of precipitates transitioned from GPII zones + eta' phase at 0.5 h to eta' phase + eta phase at 3 h. Nevertheless, the primary precipitation-strengthening mechanism at this temperature was dislocation bypassing strengthening. Although the expanding volume fraction of precipitates increased the yield strength of the composites, the coarsening of precipitates and the appearance of equilibrium. phase with inferior strengthening capacity imposed limitations on the yield strength increment. Compared with the Al-7.5Zn1.8Mg-1.7Cu alloy, the composites exhibited low yield strength after aging at 100 and 160 degrees C for 3 h, albeit with differing mechanisms. During aging at 100 degrees C, the type and size of precipitates in both materials were roughly the same, but the composites had a lower volume fraction of precipitates owing to Mg consumption caused by SiC/Al interface reactions, thus weakening the precipitation-strengthening capacity. Conversely, during aging at 160 degrees C, accelerated aging kinetics compensated for the reduction in precipitates volume fraction caused by Mg consumption. However, a low vacancy concentration led to precipitate coarsening and an increased proportion of equilibrium. phase, further weakening the precipitationstrengthening capacity of the composites.
关键词	SiC/Al-Zn-Mg-Cu composites aging precipitation behavior strengthening mechanism small angle neutron scattering
DOI	10.11900/0412.1961.2024.00060
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001281277300004
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/189613
专题	中国科学院金属研究所
通讯作者	Zhu Shize; Ke Yubin
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China 4.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang Ran,Zhu Shize,Liu Zhenyu,et al. Influence of Aging Temperatures on Precipitation Behaviors of SiC/Al-Zn-Mg-Cu Composites[J]. ACTA METALLURGICA SINICA,2024,60(8):1043-1054.
APA	Zhang Ran.,Zhu Shize.,Liu Zhenyu.,Ke Yubin.,Wang Dong.,...&Ma Zongyi.(2024).Influence of Aging Temperatures on Precipitation Behaviors of SiC/Al-Zn-Mg-Cu Composites.ACTA METALLURGICA SINICA,60(8),1043-1054.
MLA	Zhang Ran,et al."Influence of Aging Temperatures on Precipitation Behaviors of SiC/Al-Zn-Mg-Cu Composites".ACTA METALLURGICA SINICA 60.8(2024):1043-1054.