Mechanical Properties of ECAE Nanocrystalline Copper and Nickel
Mechanical Properties of ECAE Nanocrystalline Copper and Nickel
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DOI：
10.4028/www.scientific.net/jmnm.23.183
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发表时间：
2005-01
期刊：
影响因子：
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通讯作者：
S. Bansal;A. Saxena;T. Hartwig;R. Tummala
中科院分区：
文献类型：
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作者：
S. Bansal;A. Saxena;T. Hartwig;R. Tummala
采用等通道转角挤压(ECAE)法制备了高纯度、高密度的块体纳米晶铜、镍(平均晶粒度约50 nm)。纳米硬度和显微硬度测量表明，块体样品的硬度显著增加。这些材料的抗拉强度已被发现比传统形式高5-6倍，我们的实验表明，铜在100oC的温度下非常稳定，镍在250oC的温度下非常稳定。用JIC值测得纳米铜和镍的断裂韧性分别为21.66KJ/m2和12.13KJ/m2，在这两个强度水平上都是很高的。
Bulk nanocrystalline copper and nickel (average grain size ~ 50 nm) with high purity and density were synthesized by equichannel angular extrusion (ECAE). Both nanohardness and microhardness measurements revealed a significant increase in hardness of the bulk sample. The tensile strength of these materials has been found to be 5-6 times higher than conventional forms and our experiments show that Cu is extremely stable up to temperatures of 100 oC and Ni to temperatures of 250 oC. The fracture toughness, measured by the value of JIC for nc-copper and nickel have been found to be 21.66 KJ/m2 and 12.13 KJ/m2, respectively which are high for these strength levels.