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Effect of milling time on microstructure of Ti35Nb2.5Sn/10HA biocomposite fabricated by powder metallurgy and sintering

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Transactions of Nonferrous Metals Society of China 2012年第3期22卷 608-612页

作者：王晓鹏徐丽娟陈玉勇禹基道肖树龙孔凡涛刘志光哈尔滨工业大学材料科学与工程学院哈尔滨150001 哈尔滨工业大学金属精密热加工国家重点实验室哈尔滨150001 全北国立大学先进材料工程研究部

A new β-Ti based Ti35Nb2.5Sn/10 hydroxyapitite（HA） biocompatible composite was fabricated by mechanical milling and pulsed current activated sintering（PCAS）.The microstructures of Ti35Nb2.5Sn/10HA powder particles and composites sintered from the milled powders were *** indicated that α-Ti phase began to transform into β-Ti phase after the powders were mechanically milled for 8 *** mechanical milling for 12 h,α-Ti completely transformed into β-Ti phase,and the ultra fine Ti35Nb2.5Sn/10HA composite powders were *** ultra fine grain sized Ti35Nb2.5Sn/10HA sintered composites were obtained by *** hardness and relative density of the sintered composites both increased with increasing the ball milling time.

关键词： Ti35Nb2.5Sn/10HA ultrafine grain powder metallurgy milling time

Effect of Replacing Vanadium by Niobium and Iron on the Tribological Behavior of HIPed Titanium Alloys

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Acta Metallurgica Sinica(English Letters) 2017年第11期30卷 1089-1099页

作者： Mamoun Fellah Linda Aissani Mohammed Abdul Samad Alain Iosts Touhami Mohamed Zine Alex Montagnes Corinne Nouveau Mechanical Engineering Department ABBES Laghrour University P.O. 1252 40004 Khenchela Algeria Tribology Materials Surface and Interfaces GroupLaboratory of Foundry BADJI Mokhtar University BO 12CP 23000 Annaba Algeria Physics Department ABBES Laghrour University P.O.1252 40004 Khenchela Algeria Mechanical Engineering Department KFUPM Box 1180Dhahran 31261 Kingdom of Saudi Arabia Laboratory of Mechanics Surfaces and Processing Materials ARTS ET METIERS ParisTech Boulevard Louis XIV 859046 Lille Cedex France La.Bo.Ma.P ENSAM Rue Porte de Paris 71250 ClunyFrance

This study aims to examine the effect of replacing vanadium by niobium and iron on the tribological behavior of hot-isostatic-pressed titanium alloy （Ti-6Al-4V） biomaterial, using a ball-on-disk-type oscillating tribometer, under wet conditions using physiological solution in accordance with the ISO7148 standards. The tests were carried out under a normal load of 6 N, with an AISI 52100 grade steel ball as a counter face. The morphological changes and structural evolution of the nanoparticle powders using different milling times （2, 6, 12 and 18 h） were studied. The morphological characterization indicated that the particle and crystallite size continuously decrease with increasing milling time to reach the lowest value of 4 nm at 18-h milling. The friction coefficient and wear rate were lower in the samples milled at 18 h （0.226, 0.297 and 0.423; and 0.66 × 10-2, 0.87 × 10-2 and 1.51 × 10-2 μm3 N-1 i, tm-1） for Ti-6Al-4Fe, Ti-6A1-7Nb and Ti-6Al-4V, respectively. This improvement in friction and wear resistance is attributed to the grain refinement at 18-h milling. The Ti-6Al-4Fe samples showed good tribological performance for all milling times.

关键词： Tribological behavior Titanium alloys Wear testing Nanotribology milling time Hot isostatic pressing(HIPing)

An investigation on electrochemical hydrogen storage performances of Mg-Y-Ni alloys prepared by mechanical milling

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Journal of Rare Earths 2015年第8期33卷 874-883页

作者：张羊换张朋军袁泽明杨泰祁焱赵栋梁 Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

Abstract： The nanocrystalline and amorphous Mg2Ni-type electrode alloys with a composition of Mg20-xYxNi10 （x=0, 1, 2, 3 and 4） were fabricated by mechanical milling. Effects of Y content on the structures and electrochemical hydrogen storage performances of the alloys were investigated in detail. The inspections of X-ray diffraction （XRD）, transmission electron microscopy （TEM） and scanning electron microscopy （SEM） revealed that the substitution of Y for Mg brought on an obvious change in the phase composition of the alloys. The substitution of Y for Mg resulted in the formation of secondary YMgNi4 phases without altering the major phase Mg2Ni when Y content x≤1. But with the further increase of Y content, the major phase of the alloys changed into YMgNi4 phase. In addition, such substitution facilitated the glass forming of the Mg2Ni-type alloy. The discharge capacities of the as-milled alloys had the maximum values with Y content varying, but Y content with which the alloy yielded thc biggest discharge capacity was changeable with milling time varying. The substitution of Y for Mg had an insignificant effect on the activation ability of the alloys, but it dramatically improved the cycle stability of the as-milled alloys. The effect of Y content on the electrochemical kinetics of the alloys was related to milling time. When milling time was 10 h, the high rate discharge ability （HRD）, diffusion coefficient of hydrogen atom （D） and charge transfer rate all had the maximum value with Y content increasing, but they always decreased in the same condition when milling time increased to 70 h.

关键词： Mg2Ni-type alloy Y substitution for Mg milling time electrochemical performance rare earths

Properties of Mechanically Milled Nanocrystalline and Amorphous Mg–Y–Ni Electrode Alloys for Ni–MH Batteries

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 826-836页

作者： Yang-Huan Zhang Ze-Ming Yuan Tai Yang Zhong-Hui Hou Dong-Liang Zhao Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources Inner Mongolia University of Science and Technology Department of Functional Material Research Central Iron and Steel Research Institute

Nanocrystalline and amorphous Mg2Ni-type Mg20-xYxNi10（x = 0,1,2,3 and 4） electrode alloys were fabricated using mechanical *** effects of the Y content and milling time on the microstructures and electrochemical performances of the alloys were investigated in detail.X-ray diffraction and transmission electron microscopy analyses revealed that the substitution of Y for Mg yields an obvious change in the phase composition and micro morphology of the *** the Y content x ≤ 1,the substitution of Y for Mg does not change the major phase Mg2 Ni,but with a further increase in the Y content,the major phase of the alloys transforms into the YMg Ni4 YMg3 phase.A nanocrystalline and amorphous structure can be obtained by mechanical milling,and the amorphisation degree of the alloy visibly increases with increased milling *** measurements indicate that the discharge capacity of the alloys first increases and then decreases with increasing Y content and milling *** substitution of Y for Mg dramatically ameliorates the cycle stability of the as-milled alloys,and the mechanical milling more or less impairs the cycle stability of the ***,the high rate discharge ability,electrochemical impedance spectrum,Tafel polarisation curves and potential step measurements indicate that the electrochemical kinetic properties of the as-milled alloys first increase and then decrease with increasing Y content and milling time.

关键词： Mg2Ni-type alloy Y substitution for Mg milling time Electrochemical performance

Effect of milling atmosphere on structural and magnetic properties of Ni-Zn ferrite nanocrystalline

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Chinese Physics B 2015年第4期24卷 481-490页

作者： Abdollah Hajalilou Mansor Hashim Reza Ebrahimi-Kahrizsangi Mohamad Taghi Masoudi Material Synthesis and Characterization Laboratory Institute of Advanced Technology (ITMA)Universiti Putra Malaysia Advanced Materials Research Center Materials Engineering Department Najafabad Branch Islamic Azad University

Powder mixtures of Zn, NiO, and Fe2O3 are mechanically alloyed by high energy ball milling to produce Ni-Zn ferrite with a nominal composition of Ni0.36Zn0.64Fe2O4. The effects of milling atmospheres （argon, air, and oxygen）, milling time （from 0 to 30 h） and heat treatment are studied. The products are characterized using x-ray diffractometry, field emission scanning electron microscopy equipped with energy-dispersive x-ray spectroscopy, and transmitted electron microscopy. The results indicate that the desired ferrite is not produced during the milling in the samples milled under either air or oxygen atmospheres. In those samples milled under argon, however, Zn/NiO/Fe2O3 reacts with a solid-state diffusion mode to produce Ni-Zn ferrite nanocrystalline in a size of 8 nm after 30-h-milling. The average crystallite sizes decrease to 9 nm and 10 nm in 30-h-milling samples under air and oxygen atmospheres, respectively. Annealing the 30-h-milling samples at 600℃ for 2 h leads to the formation of a single phase of Ni-Zn ferrite, an increase of crystallite size, and a reduction of internal lattice strain. Finally, the effects of the milling atmosphere and heating temperature on the magnetic properties of the 30-h-milling samples are investigated.

关键词： Ni-Zn ferrite nanocrystalline mechanical alloying milling atmosphere milling time magnetic property

Photocatalytic Activity of TiO_(2) Coatings Fabricated on Al_(2)O_(3) by Mechanical Coating Technique

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Journal of Wuhan University of Technology(Materials Science) 2021年第1期36卷 1-5页

作者： WU Kaixia ZHA Wusheng CHEN Xiuli College of Intelligent Manufacturing Jincheng CollegeSichuan UniversityChengdu 611731China College of Material Science&Engineering Xihua UniversityChengdu 610039China

The titanium coatings were prepared on Al_(2)O_(3) balls by mechanical coating technique (MCT),and then the coatings were oxidized to titanium oxides(TiO_(2)) films at 300-600 ℃.The effects of different milling time and oxidation temperature on thickness of films were *** composition and microstructure of the films were analyzed by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS).The results show that the thickest coatings with an average thickness of 20 μm were obtained at the milling time of 15 *** addition,with the increase of the oxidation temperature,the oxidation of the film is *** the milling time is 15 h,the oxidation temperature is 500 ℃,and the addition of photocatalyst is 1 g/*** films have the best photocatalytic performance when the degradation rate of methyl orange solution reaches the maximum value of 74.9 %,and the films have a good reusability.

关键词： mechanical coating technique photocatalytic activity TiO_(2) milling time oxidation temperature

Raman Scattering of Nanocrystalline δ-TiN_x Synthesized by Mechanical milling

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Chemical Research in Chinese Universities 2005年第4期21卷 489-491页

作者： DINGZhan-hui YAOBin MAHong-an JIAXiao-peng QIULi-xia SUWen-hui DepartmentofPhysics JilinUnivesityChangchun130021P.R.China DepartmentofPhysics JilinUnivesityChangchun130021P.R.China／／KeyLaboratoryofExcitedStateProcessChangchunInstituteofOpticsFineMechanicsandPhysicsChineseAcademyofSciencesChangchun130022P.R.China KeyLaboratoryofSuperhardMaterials JilinUniversityChangchun130012P.R.China

Raman scattering is a powerful nondestructive technique that givesvibrational information about organic and inorganic *** scattering features,such asintensity,frequency and width,are strongly dependent on compositions,defects,short-rangeorders,crystal structures,and internal stresses of ***,it has been widely used toobtain detailed information about the structural properties ofsemiconductors,***,ceramics,catalysts,carbon based materials,and IH-V valentmetallic nitride materials,including lattice perfection,strain,crystalline,interface,andcompositional uniformity.

关键词： Raman spectrum δ-TiN_x milling time Lattice constant