Ultrahardness:Measurement and Enhancement
(0) In the quest for novel superhard materials with hardness comparable to or even higher than that of natural diamond,two issues are of central concern: how hardness can be reliably measured and how hardness can be enhanced.Here,we analyze the specific stress states of the indenter and the tested sample during an indentation hardness measurement and reveal that the traditional prerequisite that the indenter should be harder than the measured sample is not necessary to ensure a reliable hardness measurement.In fact,the indentation hardness can be reliably measured as long as the shear strength of the sample is less than the compressive strength of the diamond indenter.Also,we suggest nanostructuring(nanocrystallinity and nanotwinning)as an effect means of hardness enhancement.
Bo Xu Yongjun Tian
State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China
国内会议
大连
英文
167-172
2016-09-24（万方平台首次上网日期，不代表论文的发表时间）