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Influence of vacuum heat treatment on structure and micro-hardness of electroless Ni-P-SiC composite coating LONG Shi-guo(龙士国)1, MA Zeng-sheng(马增胜) 1, HU Wen-bin(胡文彬)2, ZHOU Yi-chun(周益春)1 1. Key... incorporation and uniform distribution were found in Ni-P-SiC composite coatings. XRD results show a broad peak of nickel and low intensity SiC peaks present on as-deposited condition. Micro-hardness......
were analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The density and micro-hardness of the alloy billets were also measured.... The alloy prepared by W-TiH2 powders has higher density than W-Ti powders, and its particle size is finer. Key words: W-Ti alloy; mechanical alloying; density; micro-hardness ......
, HRTEM, XRD, EDS and Micro-hardness. The results show that the rapidly solidified flakes are of fine dendritic cell structures with the cell size ranging from 1 to 5 μm. The Mg-6Zn-5Ca alloy in RS and annealing (200 ℃ for 1 h) states are mainly composed of α-Mg, Mg2Ca, Ca2Mg6Zn3 and a small quantity of Mg51Zn20, MgZn2 and Mg2Zn3. Micro-hardness increases with the increment of Ca content and age......
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on the surface layer were examined by SEM and element scanning. The results show that the content of aluminum increases greatly on the surface layer. The micro-hardness of alloyed layer has a more obvious... to 0.15 mm and vacuum degree from 0.04 to 0.06 MPa, the surface alloying effect becomes better. Key words: Mg alloy; evaporative pattern casting; surface alloying layer; micro-hardness 1 Introduction......
. The micro-hardnesses were also evaluated along the cross-section after various annealings. Key words: FeSi alloy; chemical vapor deposition; diffusion; magnetic properties; micro-hardness 1 Introduction... with the shape of EI cores were measured with the automatic ac B-H curve tracer. The mechanical properties were measured with the micro-hardness tester along the cross-section.3 Results......
(TEM), and electron backscattered diffraction (EBSD). The micro-hardness distribution near the crater after impact was studied. The results indicate that at the entering stage, the amount of adiabatic shear band (ASB) is the most, and the precipitates are as fine as those of the target material; the micro-hardness is higher than that at the other stages. At the stable-running stage, the amount......
FSAM过程,距板底部1 mm处截面,材料的平均应变率,晶粒尺寸,显微硬度随转速变化的预测规律如图8所示(图中取点间隔为10 mm). 图8 平均应变率,晶粒尺寸和显微硬度随转速变化规律 Fig. 8 Average strain rates, grain sizes and micro-hardness in different cases 4 结论 1) 实验... magnesium alloy[J]. Journal of Materials Engineering and Performance, 2012, 21(7): 1243-1248. [19] NASER A, DARRAS B. Micro-hardness prediction of friction stir processed magnesium alloy via response......
by electrochemistry technique, micro-hardness, SEM and XRD. The results show that the coating prepared in pure silicate system is uneven and after the addition of phosphate solution, the homogeneity...; plasma electrolytic oxidation; corrosion resistance; micro-hardness 1 Introduction Zirconium alloys are used for nuclear fuel cladding and structural components in water-cooled fission nuclear reactors due......
improvement of about 100% in micro-hardness compared with untreated materials. The variation of carbon contents with increasing sample depth resulted in a hardened layer of 300 μm in the carburized... matrix composite. Key words: titanium alloy; titanium matrix composite; solid carburization; microstructure; micro-hardness 1 Introduction Titanium and titanium alloys have been widely used in aerospace......
