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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructural and Hardness Changes during Isothermal Annealing of Nanostructured Al-11.6Fe-1.3V-2.3Si Alloy
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Microstructural and Hardness Changes during Isothermal Annealing of Nanostructured Al-11.6Fe-1.3V-2.3Si Alloy

机译：纳米Al-11.6Fe-1.3V-2.3Si合金等温退火过程中的组织和硬度变化

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摘要

Microstructural evolution and hardness change during isothermal annealing (300-550 A degrees C, 30 min) of nanostructured Al-11.6Fe-1.3V-2.3Si alloy, prepared by mechanical alloying (MA) of elemental powders, were investigated using x-ray diffraction, transmission electron microscopy, and Vickers microhardness test. The results showed that the microstructure of the alloy after 60 h of MA consisted of a nanostructured Al-based solid solution with embedded Si. Annealing of the as-milled powders led to grain growth, internal strain release, and precipitation of the Al-12(Fe,V)(3)Si compound above 400 A degrees C. The grain growth of Al enhanced above the onset temperature for the precipitation of Al-12(Fe,V)(3)Si phase. The grain size of Al after 30 min of annealing at 550 A degrees C reached similar to 50 nm. Solute drag was responsible for retarding the grain growth below 400 A degrees C, and above that temperature the grain growth was mainly limited by second-phase drag. The hardness (219 HV) of as-milled Al-11.6Fe-1.3V-2.3Si alloy decreased after annealing at 300 A degrees C, but above that temperature the hardness increased with increasing the annealing temperature and reached similar to 250 HV after annealing at 550 A degrees C for 30 min.
机译：使用X射线研究了通过元素粉末的机械合金化（MA）制备的纳米结构Al-11.6Fe-1.3V-2.3Si合金的等温退火（300-550 A摄氏度，30分钟）期间的组织演变和硬度变化。衍射，透射电子显微镜和维氏显微硬度测试。结果表明，MA经过60 h后，合金的微观结构由纳米结构的Al基固溶体和嵌入的Si组成。研磨后的粉末退火导致晶粒长大，内部应变释放以及超过400 A摄氏度的Al-12（Fe，V）（3）Si化合物沉淀。 Al-12（Fe，V）（3）Si相的析出在550 A的温度下退火30分钟后，Al的晶粒尺寸达到了50 nm左右。溶质阻力是造成晶粒长大低于400 A的原因，而在该温度以上，晶粒的生长主要受第二相阻力的限制。在300 A的温度下退火后，研磨后的Al-11.6Fe-1.3V-2.3Si合金的硬度（219 HV）降低，但在该温度以上时，硬度随退火温度的升高而增加，并在退火后达到250 HV在550 A的温度下放置30分钟。

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