共搜索到25543条信息，每页显示10条信息，共2555页。用时：0小时0分0秒687毫秒
were dispersed and distributed uniformly at the grain boundaries, due to ultrasonic treatment (UST). By EPMA, it was observed that the distribution of the main elements Al, Zn, Mg and Cu was more... of several castings, fracture of the unrefined specimens occurred in a brittle manner, whereas the cracks of the refined specimens showed quasi-cleavage fracture. Key words: ultrasonic treatment; grain......
J. Cent. South Univ. Technol. (2007)03-0363-07 DOI: 10.1007/s11771-007-0072-6 Effects of ultrasonic treatment...; Abstract: The experiment of ultrasonic treatment of roll......
. The application of stirring to the treatment of metal melts can make the primary solid phase that grows from the melt during cooling broken by shear forces. The stirring can be achieved by mechanical, ultrasonic... of crystals during ultrasonic treatment of a melt can occur by 1) undercooling of the melt by cavitation, 2) the probe that has a greater cooling effect on the melt, from which crystals separate......
C, ESPLUGAS S, GIMENEZ J, PULGARIN C. Ultrasonic treatment of water contaminated with ibuprofen [J]. Water Research, 2008, 42(16): 4243-4248. [13] LIN J J, ZHAO X S, LIU D, YU Z G, ZHANG Y, XU H... of Physical Chemistry A, 1999, 103(15): 2696-2699. [18] TORRES R A, PETRIER C, COMBET E, CARRIER M, PULGARIN C. Ultrasonic cavitation applied to the treatment of bisphenol A. Effect of sonochemical......
Ultrasonic characterization of modified Cr2O3 coatings by reflection coefficient spectroscopy LI Ji-cheng(李继承)1, LIN Li (林 莉)1, LI Xi-meng(李喜孟)1, LI Guang(李 光)2, LEI Ming-kai(雷明凯)3 1...; Abstract: Pores, microcracks and density of plasma sprayed Cr2O3 coatings before and after high-intensity pulsed ion beam (HIPIB) irradiation were investigated using the ultrasonic......
on Non-Destructive Testing [C]. 1998. [7]Tamura K, Onozaws M. Evaluation of diffusion bonding joints of FCD500-Al alloy during heat treatment using ultrasonic testing [J]. Preprints of the National...Ultrasonic echo signal fetures of dissimilar material bonding joints GANG Tie(刚 铁)1, Yasuo TAKAHASHI2 (1. State Key Lab of Advanced Welding Production Technology, Harbin Institute......
Effects of Ultrasonic Treatment on Microstructure and Mechanical Properties of Semisolid Sn-52Bi Alloy胡永俊,郑辉庭School of Material and Energy, Guangdong University of Technology摘 要:ultrasonic treatment. Nearly round and uniformly distributed primary Sn phase particles were obtained under the cavitation......
microstructure of the AZ80 alloy with pulsed ultrasonic treatment is significantly changed. Pulsed ultrasonic field significantly decreases the grain size, changes the morphologies of the β-Mg17Al12 phases... magnesium alloy with pulsed ultrasonic treatment are much higher than those of AZ80 alloy without ultrasonic field. Key words: AZ80 magnesium alloy; pulsed ultrasonic vibration; microstructure......
increases to 100 s. However, the grains become coarse and the average grain size increases to 80 μm when the ultrasonic treatment time increases to 150 s. Therefore, the best refined... of the alloys without and with ultrasonic treatment at RT are shown in Fig.6. As shown in Fig.6(a), the sample without ultrasonic vibration exhibits the brittle batten feature. Comparatively, the fracture......
. The experimental apparatus for ultrasonic treatment is shown in Fig.1. The semi-continuous casting system Table 1 Chemical composition of A280 magnesium alloy (mass fraction, %) Fig.1 Schematic diagram.... For convenience, vibration treatment without ultrasonic is defined as 0 W ultrasonic treatment. The specimens for macro- and micro-observation were taken from different locations of cross-section in the billets......
