SONG Ren-bo
,
XIANG Jian-ying
,
HOU Dong-po
钢铁研究学报(英文版)
A comparative study on mechanical properties and microstructure of 316L austenitic stainless steel between solution treated specimen and hot rolled specimen was conducted. After a specimen was subjected to solution treatment at 1050 ℃ for 6 min, its mechanical properties were determined through tensile and hardness tests. Based on the true stress vs true strain and engineering stress vs engineering strain flow curves, the work hardening rate has been explored. The results show that the solution treated specimen has an excellent combination of strength and elongation, and that this steel is easy to work-hardening during deformation. Optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffraction examinations were conducted, these reveal that twins in 316L austenitic stainless steel can be divided into suspended twin and transgranular twin which have different formation mechanisms in growth, and that the deformation induced martensite nucleated and grown in the shear band intersections can be observed, and that the fracture surfaces are mainly composed of dimples and exhibit a tough fracture character.
关键词:
316L
,
mechanical property
,
twin
,
martensite
,
fracture morphology
Powder Diffraction
The crystal structure of K(2)Zn(PO(3))(4) was determined and refined using the Rietveld method based on the isostructure model of K(2)Cu(PO(3))(4). This compound belongs to the monoclinic system with space group Cc and lattice parameters of a=11.0941(2) angstrom, b=12.5215(3) angstrom, c=7.6597(2) angstrom, and, beta=102.47(2)degrees. The chemical formula unit per unit cell is Z=4 and the calculated density is 2.938(3) g/cm(3). Zigzag [PO(3)](infinity) chains formed along the a axis, and their period contains eight PO(4) tetrahedrons. (C) 2009 International Centre for Diffraction Data. [DOI: 10.1154/1.3076081]
关键词:
K(2)Zn (PO(3))(4);crystal structure;powder diffraction;Rietveld;refinement;zno;refinement
严建华
,
冯乃谦
,
侯英新
,
王晓华
功能材料
利用差热分析、X射线衍射仪、液氮吸附BET孔经测试仪对组成为NaTi2(PO4)3-0.9 Ca3(PO4)2的含钛磷酸盐玻璃的析晶行为进行了研究.通过对该玻璃相继进行成核、析晶和酸浸泡处理制备了NaTi2(PO4)3骨架多孔微晶玻璃.证明该玻璃在646℃8h成核处理过程中产生了旋节分解特征的成分偏聚,形成了富TiO2玻璃相和富CaO玻璃相交错生长的连通结构,成核处理后的玻璃在738℃析晶过程中依次在富钛相和富钙相中析出NaTi2(PO4)3和β-Ca3(PO4)2.成核过程对析晶的促进作用是通过促进NaTi2(PO4)3的析出而实现的.
关键词:
含钛磷酸盐玻璃
,
多孔微晶玻璃
,
析晶行为
覃连敬
,
李美丽
,
覃浩
环境化学
doi:10.7524/j.issn.0254-6108.2016.05.2015112407
本文对210pb、210po快速联测方法作了深入研究,确定了适用于环境水样中210pb、210po联测的最优实验条件.在未经萃取分离情况下,以坑坏血酸+盐酸羟胺混合体系作还原剂,当盐酸浓度为0.5 mol·L-1,沉积时间为2h,沉积温度为90℃,溶液体积为50 mL时,210Bi、210po可同时自发沉积在铜片上.利用在同一衰变链上活度最终平衡的特点,通过测量210Bi计数计算得到水中210pb的活度,然后通过209 Po示踪α能谱法求得水中210po的活度.方法精密度优于10％,加标回收率在95.3％-107.6％,210pb、210po探测限分别达到1.2 mBq· L-1和0.15 mBq·L-1.利用该联测方法对粤北矿山地区环境水样进行了分析,结果表明,饮用水中210pb、210po活度浓度范围分别为(2.4-38.7) mBq·L-1和(1.0-4.1)mBq·L-1;河溪水中210pb、210Po活度浓度范围分别为(4.3-181.5) mBq·L-1和(0.7-23.3) mBq·L-1.
关键词:
210Pb
,
210po
,
联测
,
环境水
,
铀矿山
张娜娜
,
潘晓茹
,
徐国刚
,
王继扬
人工晶体学报
采用拉曼散射技术,从声子角度研究了Ga3PO7晶体的非弹性振动特性,主要内容为:采用位置对称性法从理论上计算了晶体的晶格振动模式,判定了晶体共有27个拉曼活性模,其振动模式为Γ=7Al+10E,可看作由PO43-集团形成的晶体的内振动模和由PO43-集团、O和Ga原子形成的晶体的外振动模组成;通过室温拉曼光谱实验观测到了晶体的16个拉曼活性模,包括8个外振动模和6个内振动模,并对各模进行了指认,其中高波段的声子模主要为PO4四面体的内振动模.由于晶体结构缺陷和某些内、外振动模的耦合等原因,观测到的振动模数量明显少于理论预测值.
关键词:
Ga3PO7晶体
,
非弹性振动
,
拉曼光谱
白琼宇
,
李响
,
田植
,
李勇
,
李婷
,
袁小先
,
王志军
,
李盼来
,
杨志平
人工晶体学报
采用高温固相法制备了Eu3+掺杂的KMgLa(PO4)2荧光粉.采用X射线衍射技术及光谱技术研究了材料的晶相及发光特性.研究结果显示,少量的Eu3+并未影响KMgLa(PO4)2的晶相;以260 nm紫外光或394 nm近紫外光作为激发源时,KMgLa(PO4)2∶Eu3+都发射红色光,主发射峰位于595 nm,对应Eu3+的5 D0→7F2跃迁发射;随着Eu3+掺杂量的逐渐增大,对应KMgLa(PO4)2∶ Eu3+材料的发射强度随之增大,当掺杂量为0.06Eu3+时,发射强度最大,且存在浓度猝灭现象,对应的临界距离为1.696 nm;材料的CIE参数显示,材料位于红色区域.
关键词:
发光
,
荧光粉
,
KMgLa(PO4)2
,
铕离子
Physica B-Condensed Matter
We present first-principles calculations of the magnetic properties of the organic compounds Fe[CH3PO3] (.) H2O within the framework of density functional theory (DFT) by using the full potential linearized augmented plane wave (FPLAPW) method. The total and the partial density of states (DOS), the band structure, the total energy, and the atomic spin magnetic moment of Fe[CH3PO3] (.) H2O are calculated. The calculation revealed that Fe[CH3PO3] (.) H2O is a ferromagnetic semiconductor. It has a stable ferromagnetic ground state, which is in agreement with experiment, and the spin magnetic moment is about 6.000 mu(B) per molecule, which comes mainly from Fe and O-4. (c) 2005 Elsevier B.V. All rights reserved.
关键词:
first principles;electronic structure;ferromagnetic properties;crystal-structure;magnetic-properties;chain
郭永解
,
李静
,
王继扬
,
尹鑫
,
韩树娟
,
王永政
人工晶体学报
在MoO3-K2CO3体系中,借助于自发成核法,与MoO3-Li2CO3体系进行对照,找到一个新的适合Ga3PO7晶体生长的助熔剂体系;在新助熔剂体系下,采用顶部籽晶法生长出厘米级Ga3PO7晶体,晶体尺寸为30 mm×21 mm×9 mm;对其基本性质进行表征,在测试范围内所生长的Ga3PO7晶体透过率均在80%以上,具有高的透过率和宽的透过范围.
关键词:
Ga3PO7晶体
,
新助熔剂体系
,
顶部籽晶法
