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首页> 外文期刊>Materials Science and Engineering >Development of nano-Y_2O_3 dispersed Zr alloys by mechanical alloying and spark plasma sintering
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Development of nano-Y_2O_3 dispersed Zr alloys by mechanical alloying and spark plasma sintering

机译：机械合金化和火花等离子体烧结开发纳米Y_2O_3分散Zr合金

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摘要

In the present study alloy powders with nominal composition of 45.0Zr-30.0Fe-20.0Ni-5.0Mo(alloy A), 44.0Zr-30.0Fe-20.0Ni-5.0Mo-1.0(Y_2O_3)(alloy B) and 44.0Zr-30.0Fe-20.0Ni-4.0Mo-2.0(Y_2O_3)(alloy C) (in wt%) were synthesized by mechanical alloying (MA) followed by spark plasma sintering (SPS) at different temperatures (900, 950 and 1000 ℃). Phase evolutions during milling and after consolidation were characterized by SEM, XRD and TEM analysis. An individual element go into solid solution with increase in milling time and after 10 h of milling complete solid solution was observed in alloy A. XRD, SEM and particle size analysis revealed an increase in lattice strain and decrease in particle and crystallite size with milling time. The final average particle size after 10 hours of milling was 10-11 μm for alloy A. TEM analysis revealed the crystallite size to be between 10 and 15 nm. TEM analysis of alloy C sample sintered at 1000 ℃ confirmed the presence of Mo_2Zr and FeNi along with Y_2O_3, dispersed uniformly throughout the matrix with size 10-20 nm. Density and hardness was found to increases with sintering temperature and dispersion of Y_2O_3. Alloy C sintered at 1000 ℃ exhibits maximum hardness of 16.2 GPa which was 7-8 times higher than that of the commercially available Zr alloy. The compressive strength was increased from 820 to 1200 MPa with addition of 2 wt% of Y_2O_3 dispersion. The fracture surface shows mostly brittle failure, but appreciable deformation was noticed prior to fracture. The wear tests indicate similar trend as that of hardness and abrasion was the predominant wear mechanism.
机译：在本研究中，合金粉末的标称成分为45.0Zr-30.0Fe-20.0Ni-5.0Mo（合金A），44.0Zr-30.0Fe-20.0Ni-5.0Mo-1.0（Y_2O_3）（合金B）和44.0Zr-通过在不同温度（900、950和1000℃）下进行机械合金化（MA），然后进行火花等离子体烧结（SPS），合成了30.0Fe-20.0Ni-4.0Mo-2.0（Y_2O_3）（Y）（重量％）合金C。通过SEM，XRD和TEM分析来表征研磨过程中和固结后的相变。随着铣削时间的增加，单个元素进入固溶体；铣削10 h后，合金A中观察到完全固溶体。XRD，SEM和粒度分析显示，随着铣削时间的增加，晶格应变增加，而颗粒和微晶尺寸减小。铣削10小时后，合金A的最终平均粒径为10-11μm。TEM分析显示微晶尺寸在10至15 nm之间。在1000℃烧结的合金C样品的TEM分析证实了Mo_2Zr和FeNi以及Y_2O_3的存在，均匀地分散在整个10-20nm的基质中。发现密度和硬度随着烧结温度和Y_2O_3的分散而增加。在1000℃烧结的合金C的最大硬度为16.2 GPa，比市售Zr合金高7-8倍。通过添加2wt％的Y_2O_3分散体，抗压强度从820MPa增加到1200MPa。断裂表面大多显示出脆性破坏，但是在断裂之前注意到明显的变形。磨损测试显示出类似的趋势，主要的磨损机理是硬度和磨损。

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