Nb溶质浓度对Cu-Nb机械合金化合金晶粒细化和强度增强的影响

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-09-01 DOI:10.1016/S1875-5372(18)30196-6
Lei Ruoshan , Chen Guangrun , Wang Mingpu
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引用次数: 2

摘要

采用机械合金化(MA)法制备了Nb浓度为0 wt% ~ 30 wt%的Cu-Nb合金。采用x射线衍射(XRD)、光学显微镜(OM)、能量色散x射线扫描电镜(SEM)、透射电镜(TEM)和显微硬度测试研究了Nb含量对Cu-Nb非混相体系结晶细化过程和力学性能的影响。结果表明,在Nb含量小于~ 11wt %的样品中,磨矿100 h后,Nb在Cu中完全溶解,但平衡溶解度几乎为零。随着铌含量增加至30%,MA-ed Cu-Nb粉末的晶粒细化能力增强。这是因为当Cu相位错中析出的Nb溶质数量增加时,对恢复过程的敏感性降低。Cu-30wt%Nb粉末研磨100 h后,Cu的平均晶粒尺寸仅为~ 6 nm。试样的显微硬度随铌浓度的增加而增强。MA-ed Cu-Nb合金的主要强化机制与晶粒缩小和Nb在Cu基体中的溶解有关。
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Effect of Nb Solute Concentration on Crystallite Size Refinement and Strength Enhancement in Mechanically Alloyed Cu-Nb Alloys

Cu-Nb alloys with a Nb concentration range of 0 wt%∼30 wt% were prepared by mechanical alloying (MA) at room temperature. The effects of Nb content on the crystalline refinement process and mechanical properties of the immiscible Cu-Nb system were investigated by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM) with energy-dispersive X-ray detection (EDX), transmission electron microscopy (TEM) and microhardness measurement. Results show that the completed dissolution of Nb in Cu can be achieved in the samples with Nb content less than ∼11 wt% after 100 h milling, although the equilibrium solubility level is nearly zero. The grain size refinement capability of MA-ed Cu-Nb powder is enhanced with increasing Nb content up to 30 wt%. This is because the susceptibility to recovery process becomes reduced, when the amount of Nb solutes segregated into the dislocation of Cu phase is increased. Cu-30wt%Nb powder milled for 100 h, the average Cu grain size is only ∼6 nm. The microhardness of the samples shows an enhancement with increasing Nb concentration. The main strengthening mechanisms of the MA-ed Cu-Nb alloys are linked to the grain size reduction and the dissolution of Nb into Cu matrix.

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来源期刊
稀有金属材料与工程
稀有金属材料与工程 工程技术-材料科学:综合
CiteScore
1.30
自引率
57.10%
发文量
17973
审稿时长
4.2 months
期刊介绍:
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