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| 1 | Gradient Structured Copper by Rotationally Accelerated Shot Peening显示文摘A new technology—rotationally accelerated shot peening(RASP), was developed to prepare gradient structured materials. By using centrifugal acceleration principle and large steel balls, the RASP technology can produce much higher impact energy compared to conventional shot peening. As a proof-of-concept demonstration, the RASP was utilized to refine the surface layer in pure copper(Cu) with an average grain size of 85 nm. The grain size increases largely from surface downwards the bulk, forming an800 ?m thick gradient-structured surface layer and consequently a micro-hardness gradient. The difference between the RASP technology and other established techniques in preparing gradient structured materials is discussed. The RASP technology exhibits a promoting future for large-scale manufacturing of gradient materials. | X.Wang Y.S.Li Q.Z.ang Y.H.Zhao Y.T.Zhu | 2017 | Journal of Materials Science & Technology2017，33，7： | 11 |
| 2 | 单根单壁碳纳米管导热系数随长度变化尺度效应的实验和理论显示文摘考虑纳米碳管与基体之间的热损失,采用四焊盘-3ω法测量了室温下基体表面不同长度单根单壁碳纳米管(SWNT)的导热系数.SWNT的导热系数在测试长度范围(0·5—7μm)内随长度的增大而增大,增加的幅度逐渐减小.考虑二阶3-声子过程的影响,采用改进的WV模型预测了SWNT导热系数随长度的变化规律.理论预测的声子平均自由程-175nm.导热系数的测量结果与室温下不同长度SWNT的实验结果相吻合.理论预测结果与实验结果均说明SWNT导热系数随长度变化具有尺度效应. | 王照亮 梁金国 唐大伟 Y.T.Zhu | 2008 | 物理学报2008，57，6： | 7 |
| 3 | Microstructural softening induced adiabatic shear banding in Ti-23Nb-0.7Ta-2Zr-O gum metal显示文摘Ti-23Nb-0.7Ta-2Zr-O gum metal(GM)is an attractive candidate material for applications that require superior mechanical properties.In our earlier investigation of the GM[1],geometrical softening and the generation of adiabatic shear bands(ASBs)were proposed as primary reasons for the documented anisotropic impact response.In the present study,electron backscattered diffraction(EBSD)analysis reveals two different deformed microstructures,i.e.,deformed ultrafine grains(UFGs)and dynamically recrystallized UFGs,formed in the ASBs of GM samples processed by extrusion equal channel angular pressing(ECAP),respectively.Additional calculation of temperature rise during dynamic compression suggests that the above microstructure differences in the ASBs was originated from their different maximum ASB temperatures(608 K for extruded GM and 1159 K for ECAP-processed GM).Moreover,our calculation on the temperature at the onset of ASBs indicates that microstructural softening is the primary cause for the development of ASBs in both extruded GM(321 K)and ECAP-processed GM(331 K). | Silu Liu Y.Z.Guo Z.L.Pan X.Z.Liao E.J.Lavernia Y.T.Zhu Q,M,Wei Yonghao Zhao | 2020 | Journal of Materials Science & Technology2020，54，19： | 2 |
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