张茂,胡昌义,蔡宏中,王献,魏燕.CVD制备Nb-W合金的显微组织和性能[J].稀有金属材料与工程,2022,51(8):2830~2838.[Zhang Mao,Hu Changyi,Cai Hongzhong,Wang Xian,Wei Yan.Microstructure and Properties of Nb-W Alloy Prepared via CVD[J].Rare Metal Materials and Engineering,2022,51(8):2830~2838.]
CVD制备Nb-W合金的显微组织和性能
投稿时间:2022-01-15  修订日期:2022-03-06
中文关键词:  化学气相沉积(CVD)  Nb-W合金  层状结构  晶粒尺寸  强化机制
基金项目:National Science Foundation(51661014)
中文摘要:
      采用化学气相沉积(CVD)法制备Nb-W二元合金材料,通过金相显微镜、扫描电镜、电子探针和显微硬度仪研究了Nb-W二元合金的显微组织、力学性能。结果表明,CVD法制备的Nb-W二元合金具有规则角度层状结构特征,层状结构主要以柱状晶为主,并伴随着相应的成分起伏:层与层连接处以Nb为基体,周围分布有Nb-W固溶体,层内以Nb-W固溶体为基体,周围分布着Nb原子。宏观上在沿着晶体生长方向上开始基本以W原子为主形成一个W层,随后经过(NbW)固溶过渡到Nb原子;而微观上Nb和W原子的分布又显现出含量交替变化的特征。利用有限元模拟计算分析验证Nb-W合金材料的层状结构,以及层间的成分差异,发现层间晶粒尺寸的交叠差异对力学性能起到了明显的提升作用。揭示了Nb-W合金CVD成型机理与强化机制。
Microstructure and Properties of Nb-W Alloy Prepared via CVD
英文关键词:CVD  Nb-W alloys  layered structure  grain size  strengthening mechanism
英文摘要:
      Chemical vapor deposition (CVD) method was used to prepare Nb-W binary alloy. The microstructure and mechanical properties of the Nb-W binary alloy were studied by metallographic microscopy, scanning electron microscopy, electron probe spectroscopy and microhardness tests. Results show that the resulting Nb-W binary alloy has the characteristics of a regular angle layered structure, which is mainly composed of columnar crystals with the following composition fluctuations: Nb as the matrix at the connection between the layers with Nb-W solid solution distributed around it. The Nb-W solid solution is used as the matrix in the layer around which the Nb atoms are evenly distributed. Macroscopically, the W atoms mainly form a layer along the crystal growth direction, followed by transition to Nb atoms through the NbW solid solution; microscopically, the distribution of Nb and W atoms shows the characteristics of alternating content. The layered structure of the Nb-W alloy, composition difference between the layers, and overlapping difference of the grain size between the layers were verified by finite element simulation calculations and analysis, which play a significant role in improving the mechanical properties. The CVD forming mechanism and strengthening mechanism of Nb-W alloys were also revealed.
作者单位E-mail
张茂 昆明贵金属研究所 1808110235@qq.com 
胡昌义 昆明贵金属研究所  
蔡宏中 昆明贵金属研究所  
王献 昆明贵金属研究所  
魏燕 1. 昆明贵金属研究所  
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