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New Scheme for Estimating the Free Energy of Crystallization of Amorphous Alloys
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作者 舒小林 张邦维 +1 位作者 张恒 谭肇升 《Rare Metals》 SCIE EI CAS CSCD 1992年第2期143-144,共2页
关键词 Free New Scheme for Estimating the Free Energy of crystallization of amorphous Alloys
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Crystallization Behaviour of Laser Synthesized Nanometric Amorphous Si_3N_4 Powders
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作者 Yali LI Yong LIANG Zhuangqi HU(National Key Lab. of Rapidly Solidified Nonequilibrium Alloys, Institute of Metal Research,Chinese Academy of Sciences, Shenyang, 110015, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第3期187-191,共5页
The crystallization behaviour of the laser synthesized nanometric amorphous Si3N4 powders with the particle size of 15 nm in diameter has been studied between 1200° and 1700℃ by XRD,TEM and FTIR techniques. A sm... The crystallization behaviour of the laser synthesized nanometric amorphous Si3N4 powders with the particle size of 15 nm in diameter has been studied between 1200° and 1700℃ by XRD,TEM and FTIR techniques. A small amount of β-Si3N4 formed at 1250℃ and increased slowly until the α- β transformation happened at 1700℃, whereas α-Si3N4 appeared at 1300℃ andincreased rapidly between 1500-1600℃. The formation of β phase at the lower temperature was caused by the nitridation of free Si due to the preexisted β-nuclei in the Si3N4 particles, whereasthe α phase was formed by solid crystallization from the amorphous matrix. There were α and β SiC formed at 1700℃ due to the presence of Sio and Co gases in the system. FTIR analysis shows that two new IR absorption at 1356 and 1420 cm-1, and an overall strong absorption in wide wavenumber range resulted from the powders annealed at 1600 and 1700℃ respectively 展开更多
关键词 Si AM crystallization Behaviour of Laser Synthesized Nanometric amorphous Si3N4 Powders OO
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Homogeneous Plastic Flow of Fully Amorphous and Partially Crystallized Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Bulk Metallic Glass 被引量:4
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作者 Q.WANG J.J.Blandin +2 位作者 M.Suery B.Van de Moortele J.M.Pelletier 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第6期557-560,共4页
The homogeneous plastic flow of fully amorphous and partially crystallized Zr(41.2)Ti(13.8)Cu(12.5)Ni(10)Be(22.5) bulk metallic glass (Vitl) has been investigated by compression tests at high temperatures in supercool... The homogeneous plastic flow of fully amorphous and partially crystallized Zr(41.2)Ti(13.8)Cu(12.5)Ni(10)Be(22.5) bulk metallic glass (Vitl) has been investigated by compression tests at high temperatures in supercooled liquid region. Experimental results show that at sufficiently low strain rates, the supercooled liquid of the fully amorphous alloy reveals Newtonian flow with a linear relationship between the flow stress and strain rate. As the strain rate is increased, a transition from linear Newtonian to nonlinear flow is detected, which can be explained by the transition state theory. Over the entire strain rate interval investigated, however, only nonlinear flow is present in the partially crystallized alloy, and the flow stress for each strain rate is much higher. It is found that the strain rate-stress relationship for the partially crystaltized alloy at the given temperature of 646 K also obeys the sinh law derived from the transition state theory, similar to that of the initial homogeneous amorphous alloy. Thus, it is proposed that the flow behavior of the nanocrystalline/amorphous composite at 646 K is mainly controlled by the viscous flow of the remaining supercooled liquid. 展开更多
关键词 Homogeneous plastic flow Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloy Partially crystallized amorphous alloy
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Manufacture of Bulk Amorphous Crystal and Micro-Crystal for Pr_(60)Cu_((20-x))Ni_(10)Al_(10)Fe_x and Characteristics of Its Magnetic Apparatus 被引量:1
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作者 孙晓华 赵军 +1 位作者 孙广杰 刘长升 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第z2期332-334,共3页
Bulk amorphous crystal and microcrystal for Pr60Cu(20-x)Ni10Al10Fex (x = 0, 8, 15, 20) with the diameter ofΦ2 ~ 6 mm were manufactured by electric arc smelting, high frequency heating and copper mold upper suction ca... Bulk amorphous crystal and microcrystal for Pr60Cu(20-x)Ni10Al10Fex (x = 0, 8, 15, 20) with the diameter ofΦ2 ~ 6 mm were manufactured by electric arc smelting, high frequency heating and copper mold upper suction casting, and its structure was analyzed by X-ray diffract meter. It showed soft magnetic characteristic gradually when Fe content in it was up to 8% . The material was applied to magnetic-electric sensor as key component, output signal of which was measured with the change of Fe content. It shows that the signal changes from weak to strong with the increase of Fe content and presents the largest peak value when Fe is replaced by Cu completely. 展开更多
关键词 Pr-based bulk amorphous crystal copper mold upper suction casting soft magnetic property sensor rare earths
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Mechanical alloying characteristic and thermal stability of Al_(78)Fe_(20)Zr_2 amorphous powders 被引量:1
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作者 ZHOU Shuzhu WANG Wenwu 《Rare Metals》 SCIE EI CAS CSCD 2010年第2期226-229,共4页
The powders of pure Al, Fe, and Zr for preparing Al78Fe20Zr2 were subject to a high-energy planetary ball milling.The microstructure evolution of the mixtures at the different intervals of milling was characterized by... The powders of pure Al, Fe, and Zr for preparing Al78Fe20Zr2 were subject to a high-energy planetary ball milling.The microstructure evolution of the mixtures at the different intervals of milling was characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM) and differential scanning calorimetry(DSC).It was found that a nearly complete amorphization could be achieved in the mixtures after ball milling for 23 h.Further ball milling led to the crystallization of the amorphous powders.A long time ball milling, e.g., 160 h, led to a complete crystallization of the amorphous powders and the formation of Al3Zr and Al13Fe4.The crystallization products caused by ball milling are almost the same as that produced by isothermal annealing of the amorphous powders in vacuum at 800 K for 1 h. 展开更多
关键词 amorphous powder crystallization mechanical alloying amorphization
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Effect of Thermal Treatment on the PA-6 in the Blends
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作者 仇武林 罗善国 +4 位作者 罗运军 谭惠民 李政军 麦堪成 曾汉民 《Journal of Beijing Institute of Technology》 EI CAS 1999年第2期13-18,共6页
Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing tempera... Aim To investigate the multiple melting behavior of polyamide 6(PA 6) in polyamide 6/linear low density polyethylene blends crystallized from the crystal amorphous state. Methods\ The effects of annealing temperature, annealing time, heating rate, and the step wise annealing were measured by DSC. Results and Conclusion\ There exists a critical heating rate affecting the middle temperature melting peak. When annealed at the temperature close to the melting peak, the main melting peak of PA 6 shifted to a higher temperature. Within a short time, annealing time has much effect on neat PA 6 but little effect on PA 6 in the blends. Addition of PE results in a decreasing in the height of melting peak. These phenomenon show that the melting behavior of PA 6 was affected by PE, compatibilizer, as well as thermal treatment. 展开更多
关键词 polyamide 6 BLENDS crystal amorphous state melting behavior
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Pulsed-Laser Annealing of NiTi Shape Memory Alloy Thin Film
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作者 S.K. Sadrnezhaad E. Rezvani +1 位作者 S. Sanjabi A.A. Ziaei Moayed 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2009年第1期135-140,共6页
Local annealing of amorphous NiTi thin films was performed by using an Nd:YAG 1064 nm wavelength pulsed laser beam. Raw samples produced by simultaneous sputter deposition from elemental Ni and Ti targets onto unheat... Local annealing of amorphous NiTi thin films was performed by using an Nd:YAG 1064 nm wavelength pulsed laser beam. Raw samples produced by simultaneous sputter deposition from elemental Ni and Ti targets onto unheated Si (100) and Silica (111) substrates were used for annealing. Delicate treatment with 15.92 W/mm^2 power density resulted in crystallization of small spots; while 16.52 and 17.51 W/mm^2 power densities caused ablation of the amorphous layer. Optical microscopy, scanning electron microscopy, X-ray diffraction and atomic force microscopy were performed to characterize the microstructure and surface morphology of the amorphous/crystallized spot patterns. 展开更多
关键词 Local heat treatment NiTi thin film Pulsed laser annealing amorphous/crystallized spot composite
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TG method for studying crystallization of amorphous alloys
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作者 陈宁 林勤 +1 位作者 叶文 杨会生 《Chinese Science Bulletin》 SCIE EI CAS 1996年第4期349-350,共2页
The nano-crystalline materials with many special and super magnetic properties could be synthesized by fractional crystallization of amorphous alloys. Since this new method for preparation of nano-crystalline material... The nano-crystalline materials with many special and super magnetic properties could be synthesized by fractional crystallization of amorphous alloys. Since this new method for preparation of nano-crystalline materials was introduced, the crystallization kinetics of amorphous alloys has been studied in more and more intensive investigations. So far, almost all experiments on the crystallization kinetics are conducted by differential 展开更多
关键词 TG method for studying crystallization of amorphous alloys
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Superhydrophobic Surfaces Produced by Applying a Self- Assembled Monolayer to Silicon Micro/Nano-Textured Surfaces 被引量:12
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作者 Yong Song Rahul Premachandran Nair +1 位作者 Min Zou Yongqiang Wang 《Nano Research》 SCIE EI CSCD 2009年第2期143-150,共8页
A novel way of producing superhydrophobic surfaces by applying a self-assembled monolayer(SAM)to silicon micro/nano-textured surfaces is presented in this paper.The micro/nano-textured surfaces on silicon substrates w... A novel way of producing superhydrophobic surfaces by applying a self-assembled monolayer(SAM)to silicon micro/nano-textured surfaces is presented in this paper.The micro/nano-textured surfaces on silicon substrates were generated by the aluminum-induced crystallization(AIC)of amorphous silicon(a-Si)technique.Octadecyltrichlorosilane(OTS)SAMs were then applied to the textured surfaces by dip coating.The topography and wetting properties of the resulting surfaces were characterized using scanning electron microscopy(SEM)and a video-based contact angle measurement system.The results show that by introducing OTS SAMs on the silicon micro/nano-textured surfaces,superhydrophobic surfaces with water contact angles(WCAs)of 155°were obtained,as compared to the WCAs of OTS-modified smooth silicon surfaces of about 112°.Surface topography was found to directly influence the WCA as predicted by the Cassie-Baxter model. 展开更多
关键词 SUPERHYDROPHOBIC wetting property micro/nano-textured surfaces OCTADECYLTRICHLOROSILANE self-assembled monolayer aluminum-induced crystallization of amorphous silicon
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