Mechanical Properties of Nanocrystalline and Ultrafine‐Grained Nickel with Bimodal Microstructure
Mechanical Properties of Nanocrystalline and Ultrafine‐Grained Nickel with Bimodal Microstructure
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DOI：
10.1002/adem.201300570
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发表时间：
2014-11
影响因子：
3.6
通讯作者：
Tao Qian;I. Karaman;M. Marx
中科院分区：
文献类型：
--
作者：
Tao Qian;I. Karaman;M. Marx
这项工作的目的是使用双峰微观结构来提高纳米晶（NC）和超细晶（UFG）材料的延展性和抗疲劳性，同时保持材料的高强度。通过脉冲电沉积生产的镍板被用作NC基材，而作为UFG基材的高纯镍通过等通道角挤压加工。经过不同的热处理后，在NC/UFG和UFG/粗晶（CG）的尺寸范围内可以实现双峰组织。虽然UFG/CG镍显示出改善的延展性，但对耐疲劳性的影响很小，NC/UFG镍显示出非凡的耐疲劳性。
The aim of this work was to use bimodal microstructures to improve ductility and fatigue resistance of nanocrystalline (NC) and ultrafine‐grained (UFG) materials while keeping the materials’ high strength. Nickel plates produced by pulsed electrodeposition were used as NC base material while as UFG base material high‐purity nickel was processed by equal channel angular pressing. After different heat treatments, bimodal microstructures could be realized in the size ranges of NC/UFG and UFG/coarse grained (CG). While the UFG/CG nickel revealed an improved ductility but little influence on the fatigue resistance, the NC/UFG nickel shows an extraordinary fatigue resistance.