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Search Results: 1 - 10 of 7125 matches for " Mingxiu QUAN "
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Annealing Embrittlement in Fe-Mo-Si-B Amorphous Alloy
Jianmin LI,Mingxiu QUAN,Zhuangqi HU,

材料科学技术学报 , 1997,
Abstract: Annealing at Ta=200℃ or so, the enhancement in the average tensile fracture strength of as-quenched (Fe0.99Mo0.01)78Si9B13 metallic glass increases about 7~8%. The origin of the annealing embrittlement at 244℃ in the metallic glass (Fe0.99 Mo0.01)78Si9B13 was revealed that due to the formation of nanoscale granular with bcc structure resulting in the stress localization.The temperature of annealing embrittlement was in agreement with the calculated value from Tbcc=0.637Tc (Tc is the crystallized temperature), based on micromechanism of crystallization of metallic glass.
Micromechanism of Crystallization in Multicomponent Metallic Glass
Jianmin LP,Mingxiu,QUAN,Zbuangqi HU,

材料科学技术学报 , 1996,
Abstract: A micromechanism in an atomic level of crystallization of transition metal-metalloid TM80M20 metallic glass is thermodynamically proposed by taking Bernal polyhedra as the starting structure of metaIlic glass. It is composed of two competitively processes: (i) densification process of atom cluster leads to the formation of the precursor in amorphous matrix, (ii) the growth of atom cluster leads to the decreasing packing density. The preferential precipitation sequence of metastable phase is bcc, bct. cpc (close-packed crystal, hcp or fcc structure). A metastable phase decomposition (Fe,Mo)23B6 (fcc)-Fe2B highly strained bct phase was observed during crystallization of (Fe0.99Mo0.01)78Si9B13 metallic glass, which is related to the occurrence of nanocrystalline.
晶态 Ni 粉与非晶 Fe_(78)Si_(12)B_(10)球磨时的固态反应

WANG Kaiyan QUAN Mingxiu WANG Jingtang,

材料研究学报 , 1993,
Abstract: Solid state reaction between crystalline Ni and amorphous Fe_(78)Si_(12)B_(10) powdersduring mechanical milling is investigated in this paper.For the powder mixtures with contentsof 17at.-% and 30at.-% Ni,the reaction results in the formation of new amorp
Ferromagnetic Fe-based Amorphous Alloy with High Glass-forming Ability

Min XU,Mingxiu QUAN,Zhuangqi HU,Lizhi CHENG,Kaiyuan HE,

材料科学技术学报 , 2001,
Abstract: A ferromagnetic amorphous Fe73Al4Ge2Nb1P10C6B4 alloy with high glass-forming ability was synthesized by melt spinning. The supercooled liquid region before crystallization reaches about 65.7 K. The crystallized structure consists of alpha -Fe, Fe3B, FeB, Fe3P and Fe3C phases. The Fe-based amorphous alloy exhibits good magnetic properties with a high saturation magnetization and a low saturated magnetostriction. The crystallization leads to an obvious decrease in the soft magnetic properties.
Investigation of glass formability in Al-Co-Y ternary system

Pan DONG,Jia ZHANG,Wanliang HOU,Xinchun CHANG,Jianqiang WANG,Mingxiu QUAN,

材料科学技术学报 , 2008,
Abstract: The glass formation was investigated in the melt-spun Al-rich AI-Co-Y alloys by the microstructure evolution.The best glass former Al88Co5Y7 with the thickness of 230 μm was found, and its glass forming ability (GFA) was higher than that of previously reported Al88Co4Y8 alloy. This result indicates that GFA is strongly sensitive to the alloy composition in the system. The phase selection method is an effective way to locate the optimum glass formation composition rather than Trg and △Tx parameters.
Formation of Omega-like Nanocrystalline in the Melt-Spun Nd85Al15 Alloy by Phase Transformation
Formation of Omega—like Nanocrystalline in the Melt—Spun Nd85Al15 Alloy be Phase Transformation

Jia ZHANG,Wensheng SUN,Mingxiu QUAN,Zhuangqi HU,

材料科学技术学报 , 2002,
Abstract: Microstructure and subsequent phase transformations on heating of the melt-spun Nd85Al15 alloy have been studied by X-ray diffraction,transmission electron microscopy and differential scanning calorimetry.The melt-spun Nd85Al15 alloy shows two-stage transformation processes as follows:amorphous 72 nm supersaturated bcc-Nd(Al) solid solution→7 nm omega-like phase→AlNd3 hexagonal Nd.The activation energies for the first and second transformation were found to be 100kJ/mol and 188kJ/mol,respectively.The formation mechanism of nanoscale omega-like phase is discussed.

ZHOU Lanzhang,GUO Jianting,QUAN Mingxiu,

金属学报 , 1997,
Abstract: 四种元素粉末的混合物在室温下球磨,当球磨时间达到107min时,原位热分析监测到一个放热化学反应的发生,分析表明大量的NiAl和TiC化合物反应生成,其反应合成机理属于燃烧合成反应机制,包含着两个独立的化学反应,即Ni+Al→NiAl,Ti+C→TiC燃烧反应后,还存在少量的元素粉末进一步球磨导致NiAl和TiC的逐渐生成,终产物中TiC的晶粒尺寸约为NiAl晶粒尺寸的2.5倍,与传统观点相反,归
Effects of Pressure on the Solidification Microstructure of Mg65Cu25Y10 Alloy
Effects of Pressure on the Solidification Microstructure of Mg_(65)Cu_(25)Y_(10) Alloy

Jia ZHANG,Keqiang QIU,Aimin WANG,Haifeng ZHANG,Mingxiu QUAN,Zhuangqi HU,
,Keqiang QIU,Aimin WANG,Haifeng ZHANG,Mingxiu QUAN and Zhuangqi HU Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,China

材料科学技术学报 , 2004,
Abstract: The Mg65Cu25Y10 melts were quenched at a temperature of 973 K under various pressures in the range of 2~5 GPa and ambient pressure. The microstructure of the solidified specimens has been investigated by X-ray diffraction,transmission electron microscope and electron probe microanalysis. Experimental results show that the pressure has a great influence on the solidification microstructure of the Mg65Cu25Y10. At ambient pressure, the solidification products are Mg2(Cu,Y) and a very small amount of Y2O3 inclusion. As the pressure is above 2 GPa, a new Cu2(Y,Mg) phase appears, while Y2O3 is not observed at the pressure of 3, 4 and 5 GPa. When the pressure increases from 2 GPa to 5 GPa, the grain sizes of Mg2(Cu,Y) and Cu2(Y,Mg) decrease from 125, 96 nm to 80,7 nm, respectively. The mechanisms for the effects of the pressure on the phase evolution and microstructure during solidification process of Mg65Cu25Y10 alloy have been discussed.

YE Lilei,HUANG Jianyu,LIU Zhiguang,QUAN Mingxiu,

金属学报 , 1996,
Abstract: The combustion reaction was observed during mechanical alloying Ni_(20)Ti_(50)C_(30), and the agglomerates and powders coexisted in final product. With the analysis of X-ray diffraction (XRD) and the observation of scanning electron microscope (SEM), it is indicated that melting occurred in the combustion reaction. The product is composed of TiC phase and NiTi compound. It is regarded that the initial TiC is produced by the heavy collision of balls during milling, and then the large heat released from the TiC formation induces the latter reactions.
31P solid-state NMR spectroscopy of VPO catalysts
Mingxiu Li,Shutao Yang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882869
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