An Insight into Machining of Thermally Stable Bulk Nanocrystalline Metals
An Insight into Machining of Thermally Stable Bulk Nanocrystalline Metals
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深入了解热稳定块状纳米晶金属的加工
DOI：
10.1002/adem.201800405
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发表时间：
2018
影响因子：
3.6
通讯作者：
Darling, Kristopher A.
中科院分区：
文献类型：
--
作者：
Hammond, Vincent H.;Luckenbaugh, Thomas L.;Aniska, Michael;Gray, David M.;Smeltzer, Joshua A.;Hornbuckle, B. Chad;Marvel, Christopher J.;Solanki, Kiran N.;Schmitz, Tony;Darling, Kristopher A.
最近的进展使得能够生产具有热稳定微观结构的纳米晶粒金属合金。因此，批量样品的生产以及随后的标准化测试样品的加工和测试现在是真实的可能性。因此，作者首次报告了块体纳米晶材料的深入表征和可加工性。特别是，这项研究解决了加工的可行性，以及在何种程度上，如果有的话，微观结构改变，由于加工过程中产生的高应力和温度。为了实现这一目标，一系列的铜钽纳米晶螺纹圆柱形拉伸样品加工从挤压棒。采用透射电子显微镜等先进表征技术，表明Cu-Ta合金的晶粒尺寸进一步减小了约三分之一。考虑到估计的260%的总应变和机械加工操作导致的适度温度升高，晶粒尺寸的这种减小是非常值得注意的。这种意想不到的晶粒细化归因于分散在基质中的钽基纳米团簇，其限制了加工过程中初始微观结构中的晶粒生长。总体而言，作者观察到块状纳米晶材料的连续切屑形成和可加工性，这源于稳定的纳米晶粒，并具有接近弹性的完美塑性材料行为。
Recent advances have enabled the production of nano‐grained metallic alloys with a thermally stable microstructure. Consequently, the production of bulk samples and subsequent machining and testing of standardized test specimens is now a real possibility. Therefore, for the first time, the authors report on the in‐depth characterization and machinability of bulk nanocrystalline materials. In particular, this study addresses the feasibility of machining and to what extent, if any, the microstructure is altered due to the high stresses and temperature incurred during machining. Toward that goal, a series of copper–tantalum nanocrystalline threaded cylindrical tensile samples are machined from extruded rods. Advanced characterization techniques, such as transmission electron microscopy, are employed which indicated that the grain size of the Cu–Ta alloy was further reduced by approximately one‐third. This reduction in grain size is quite noteworthy given an estimated total strain of 260% and moderate temperature increase resulting from the machining operation. This unexpected grain refinement is attributed to tantalum‐based nanoclusters dispersed through the matrix which limit grain growth in the initial microstructure during machining. Overall, the authors observe a continuous chip formation and machinability of bulk nanocrystalline materials, which stems from stable nano‐grains and having a near elastically perfectly plastic material behavior.
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影响因子：
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