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首页> 外文期刊>Science and Technology of Advanced Materials >Quantitative characterization of precipitate free zones in Al-Zn-Mg(-Ag) alloys by microchemical analysis and nanoindentation measurement
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Quantitative characterization of precipitate free zones in Al-Zn-Mg(-Ag) alloys by microchemical analysis and nanoindentation measurement

机译：微量化学和纳米压痕法定量表征Al-Zn-Mg（-Ag）合金中无沉淀区

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摘要

To correlate quantitatively the mechanical properties of precipitate free zones (PFZ) with the corresponding microstructural and compositional characteristics, TEM observation, EDX analysis and nanoindentation measurement have been performed in the vicinity of grain boundaries in Al-4.9 mass%Zn-1.8 mass%Mg (-0.28 mass%Ag) alloys. The remarkable decreases in hardness and solute concentrations were observed towards grain boundaries even in the regions just outside PFZ. With increasing aging time, it is firstly revealed that the hardness inside PFZ monotonously decreases although the hardness inside grains increases in the earlier stage of aging. Three distinct regions of "PFZ", "Transition-area" and "Grain-region" were therefore proposed to explain the origins of such age-hardening behavior observed in this work. In the Ag-added alloy, on the other hand, the hardness could be maintained up to closer regions to grain boundaries at the same level as that inside grains.
机译：为了将无沉淀区（PFZ）的机械性能与相应的显微组织和组成特征定量关联，在Al-4.9质量％Zn-1.8质量％Mg的晶界附近进行了TEM观察，EDX分析和纳米压痕测量（-0.28质量％Ag）合金。即使在PFZ外部，也观察到硬度和溶质浓度向晶界的显着降低。随着时效时间的增加，首先揭示出虽然时效初期晶粒内部的硬度增加，但PFZ内部的硬度却单调降低。因此，提出了三个不同的“ PFZ”区域，“过渡区域”和“粮食区域”，以解释这项工作中观察到的这种时效硬化行为的起源。另一方面，在添加Ag的合金中，可以将硬度保持到与晶粒内部相同水平的更靠近晶界的区域。

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