李萍
,
王莹
稀土
采用组织观察、拉伸试验和理论计算,研究了Y对镁合金AZ81的晶粒细化作用以及由此产生的细晶强化作用.结果表明,Y加入镁合金AZ81后可生成高熔点的Al2Y相,Al2Y相可成为α-Mg基体和β-Mg17Al12相的有效异质形核核心,从而细化合金的晶粒尺寸,改善β-Mg17Al12相的形貌,起到有效的细晶强化作用,提高合金的室温强度.
关键词:
镁合金AZ81
,
Y
,
屈服强度
,
细晶强化
秦飞
,
项敏
,
武伟
金属学报
doi:10.3724/SP.J.1037.2013.00782
为得到硅通孔电镀填充铜(TSV-Cu)的力学性能,对TSV-Cu进行了Berkovich纳米压痕实验.基于Oliver-Pharr算法和连续刚度法确定TSV-Cu的弹性模量和硬度分别为155.47 GPa和2.47 GPa;采用有限元数值模拟对纳米压痕加载过程进行反演分析,通过对比最大模拟载荷与最大实验载荷,确定TSV-Cu的特征应力和特征应变;由量纲函数确定的应变强化指数为0.4892;将上述实验结果代入幂强化模型中,确定TSV-Cu的屈服强度为47.91 MPa.最终确定了TSVCu的幂函数型弹塑性应力-应变关系.
关键词:
硅通孔电镀填充铜
,
纳米压痕
,
弹性模量
,
屈服强度
,
应变强化指数
R. Chen
,
G.D. ZhanG
,
R.J Wu and H Sekine(Institute of Composite Materials
,
Shanghal Jiao Tong University Shanghai 200030
,
China)(Department of Aeronautics and Space Engineering
,
Tohoku University Sendai 980
,
Japan)
金属学报(英文版)
The effects of SiC particle and whisker on the strength of aluminum alloy matrix composites have been discussed. The effects of the characteristics of discontinuons reinforcements on the strength of compsites was revealed on the basis of a review of the elastic-plastic finite element method which was applied to predict the stress-strain constituent relationship for particle and whisker reinforeed MMCs. It is snggested that the reinforcement shape or morphology, aspect ratio and distribution in the matrix should be considered in order to get more accumte numerical results. Theoretical strength analysis models predicted the trend of the strength for particle MMCs, but the theoretical results are generally lower compared with the experimental results, especially for the lower strength aluminum alloy. This is becaase strength theories did not consider the change of microstructure of reinforced matrix after particle incorpomtion. We have proposed a combined microstructure strengthening analysis, and the prediction is consistent with the eperimental results.
关键词:
SiC particle
,
null
,
null
,
null
,
null
