材料期刊网

DISTRIBUTION OF Ce AND S IN Fe-C-Si ALLOY AND THEIR INFLUENCE ON MORPHOLOGY OF GRAPHITE

DU Weixi HAN Qiyong JIANG Qing ZHANG Zhongzhi ZHONG Weizhen LIU Shaoshou Jilin University of Technology , Changchun , China [Originally published in ACTA METALL SIN (CHINESE EDN) 24(5) 1988pp B313—B319 , received 17 Octorber 1986 , in revised form 3 April 19871 Beijing University of Science and Technology

金属学报(英文版)

Electrolytic extraction-radiometry and microradioautography techniques were used to study the distribution of nodulizing element Ce and anti-nodulizing element S in phases of high purity Fe-C-Si alloy.The results show that,besides forming inclusions,most of Ce atoms concentrate in graphite firstly.As the Ce content increases,the concentration of Ce in graphite tends to saturate,relatively large amount of Ce dissolves in the alloy.Usually,the sulphur also concentrates in graphite.However,it may exist in the form of FeS at the eutectic colony boundaries,if the concentration of S is at a quite high level.Very little amount of S dissolves in the alloy.The morphology of graphite depends upon the degree of saturation of Ce.It appears as nodular when Ce was saturated and,as vermicular while it was semi-saturated.

关键词: Ce.S.Fe-C-Si alloy , null

稀土对B319铝合金组织性能的影响

吴国华 , 马春江 , 王叶双 , 朱燕萍 , 丁文江

金属学报

利用等离子发射光谱仪、能谱仪、图像分析仪、差分扫描量热仪(DSC)以及金相分析等手段,研究了稀土(RE)对消失模铸造B319铝合金孔隙率、组织和性能的影响.研究结果表明,在铸件冷却速度为0.2℃/s的消失模铸造条件下,B319铝熔体中加入0.15%RE(质量分数),可以使Si相得到一定程度的变质.并可使消失模铸造铝件的孔隙率明显降低.这是消失模铸造慢冷条件下RE提高合金力学性能的重要原因.随着RE加入量的增加,合金的抗拉强度和延伸率得以提高,当RE含量为0.15%时,相对于未加RE时的情况,σb和δ分别增加了14%和23.5%.当RE含量＞0.15%时,出现富稀土的块状金属间化合物Ti2LaAl20,使合金的机械性能,尤其是塑性降低.

关键词: 稀土合金 , null , null , null , null

稀土对B319铝合金组织性能的影响

吴国华 , 马春江 , 王叶双 , 朱燕萍 , 丁文江

金属学报 doi:10.3321/j.issn:0412-1961.2002.07.007

利用等离子发射光谱仪、能谱仪、图像分析仪、差分扫描量热仪(DSC)以及金相分析等手段,研究了稀土(RE)对消失模铸造B319铝合金孔隙率、组织和性能的影响.研究结果表明,在铸件冷却速度为0.2℃/s的消失模铸造条件下,B319铝熔体中加入0.15%RE(质量分数),可以使Si相得到一定程度的变质.并可使消失模铸造铝件的孔隙率明显降低.这是消失模铸造慢冷条件下RE提高合金力学性能的重要原因.随着RE加入量的增加,合金的抗拉强度和延伸率得以提高,当RE含量为0.15%时,相对于未加RE时的情况,σb和δ分别增加了14%和23.5%.当RE含量＞0.15%时,出现富稀土的块状金属间化合物Ti2LaAl20,使合金的机械性能,尤其是塑性降低.

关键词: 稀土合金 , 铝合金 , 组织 , 孔隙率 , 消失模铸造

硼酸酯改性Mg2B205w／PP复合材料

陈善华 , 吴永嘉 , 金培鹏

材料科学与工艺

为了提高聚丙烯（PP）的强韧性能，采用熔融共混法分别制备了质量分数为0～15％的Mg2B2O5晶须（MBOw）和硼酸酯偶联剂（BE）改性MBOw填充PP基复合材料，测试了PP及其复合材料的拉伸、冲击性能，并通过红外光谱、接触角测试、扫描电镜分析等对复合材料界面作用机理进行了研究，结果表明：MBOw与BE之间存在化学和物理吸附层；PP与BE处理前后的MBOw之间不存在化学键合；BE改性MBOw／PP复合材料中PP与MBOw之间的粘附功和表面张力之比由BE表面处理前的8．7增至处理后的315.0，明显改善了基体中MBOw的分散性及其界面结合性能，提高了BE改性MBOw／PP复合材料的拉伸及冲击性能。

关键词: 硼酸镁晶须 , 硼酸酯偶联剂 , 聚合物基复合材料 , 界面结合 , 力学性能

Formation of glassy Ti50Cu20Ni24Si4B2 alloy by high-energy ball milling

Materials Letters

The elemental powder mixtures with a nominal composition of Ti50Cu20Ni24Si4B2 can be amorphized under high-energy ball milling. A well-defined glass transition before crystallization appears in the obtained amorphous phase during heating in a differential scanning calorimeter. A wide supercooled liquid region DeltaT(x) is available to be about 57 K. Crystallization of the ball-milled amorphous phase was performed through one step to form the metastable (Ni, Cu)Ti phase with cubic structure and an unknown phase, followed by subsequent grain growth. The reduced glass transition temperature of the alloy was determined to be 0.56. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词: mechanical alloying;metallic glasses;supercooled liquid;titanium;supercooled liquid region;amorphous-alloys;mechanical-properties;thermal-stability;cu-ni;crystallization

高能球磨形成具有明显玻璃转变的Ti50Cu20Ni24Si4B2非晶态合金

张来昌 , 徐坚

金属学报

在高能球磨作用下,名义成分为Ti50CU20Ni24Si4B2的元素粉末混合物可通过固态反应非晶化.差示扫描量热分析(DSC)表明,球磨获得的非晶相在发生晶化转变之前出现明显的玻璃转变,过冷液态温度区间的宽度(△Tx)可达到57 K.非晶态Ti50CU20Ni24Si4B2合金加热时的晶化转变由一步完成,同时形成立方结构的(Ni,Cu)Ti相和其它未知相,为共晶型转变,随后发生晶化产物的进一步晶粒长大.非晶态Ti50Cu20Ni24Si4B2合金的约化玻璃转变温度(Trg)为0.56.

关键词: 钛.非晶态台金.过冷液体 , null

高能球磨形成具有明显玻璃转变的Ti50Cu20Ni24Si4B2非晶态合金

张来昌 , 徐坚

金属学报 doi:10.3321/j.issn:0412-1961.2002.03.017

在高能球磨作用下,名义成分为Ti50CU20Ni24Si4B2的元素粉末混合物可通过固态反应非晶化.差示扫描量热分析(DSC)表明,球磨获得的非晶相在发生晶化转变之前出现明显的玻璃转变,过冷液态温度区间的宽度(△Tx)可达到57 K.非晶态Ti50CU20Ni24Si4B2合金加热时的晶化转变由一步完成,同时形成立方结构的(Ni,Cu)Ti相和其它未知相,为共晶型转变,随后发生晶化产物的进一步晶粒长大.非晶态Ti50Cu20Ni24Si4B2合金的约化玻璃转变温度(Trg)为0.56.

关键词: 钛.非晶态台金.过冷液体 , 机械合金化

Na5[B2P3O13]晶体双晶结构的研究

李志华 , 傅佩珍 , 吴以成 , 陈创天

人工晶体学报 doi:10.3969/j.issn.1000-985X.2003.06.021

采用泡生法和b向籽晶生长出尺寸为22mm×24mm×20mm的透明Na5[B2P3O13]晶体.晶体定向中发现(100)和(001)晶面的一级衍射出现双峰;正交偏光显微镜下观察晶体的(010)切片,看到清晰的明暗条纹;当一束激光正入射(010)切片时,产生衍射现象;用同步辐射白光X射线形貌术拍摄了(100)、(010)和(001)切片的Laue像,观察到了晶体的孪晶结构,再借助(010)切片的化学腐蚀研究,推出该晶体为规则的聚片双晶,其结合面为(001).

关键词: Na5[B2P3O13]晶体 , 双晶 , 同步辐射X射线白光形貌术 , 激光衍射

Superposition model parameters (b)over-bar(2) and t(2) for d(5) ion Cr+ in sulfides

Physica B-Condensed Matter

The superposition model has been applied to the studies of the zero-field splitting b(2)(0) for AgGaS2: Cr+ crystal and the uniaxial stress EPR data for ZnS: Cr+ crystal. These studies show that for [CrS4](7-) groups in crystals, the intrinsic parameter (b)over-bar(2)(R-0) approximate to -0.035(8)cm(-1) with the reference distance R-0 approximate to 2.378(20) Angstrom and the power-law exponent t(2) approximate to 14(4). To our knowledge, this is the first time that the superposition model parameters (b)over-bar(2) and t(2) are given for Cr+-S2- combination (or other Crc-X combinations). (C) 1999 Published by Elsevier Science B.V. All rights reserved.

关键词: electron paramagnetic resonance;superposition model;Cr+ ion;AgGaS2;ZnS;zero-field splittings;crystals;transition;mn-2+;fe-3+

B位Co掺杂对Sr14Cu24O41的结构和电输运的影响

林颖 , 魏伟 , 熊锐 , 胡妮 , 汪丽莉 , 余祖兴 , 汤五丰 , 石兢

低温物理学报 doi:10.3969/j.issn.1000-3258.2007.04.003

采用固相反应法制备了系列Sr14(Cu1-xCox)24O41(x=0,0.02,0.06,0.1,0.14,0.18)的样品,X-射线衍射结果显示所有样品均为单相,且Co的掺杂几乎不改变样品的晶格常数,电子衍射和X-射线光电子能谱的测量结果证实Co替代的是链上的Cu原子;电输运的测量显示,Co掺杂样品表现为半导体行为,且渡越温度T 随掺杂量的增加逐渐减小.

关键词: 强关联 , Sr14Cu24O41 , 自旋梯状结构 , 电输运