材料期刊网，材料期刊，材料类期刊，材料期刊投稿

In this study we conducted single V-groove butt welding (GTAW) on three types of heat treatable aluminum alloys 2024-T351, 6061-T6 and 7075-T6 and compared the angular distortion levels of the three aluminum alloys at different Vee preparation angles with or without restraint. Experimental results demonstrated that when the Vee preparation angle was 0℃ (I-shaped groove), the angular distortion level of the restrained weldment can exceed that of the unrestrained weldments. Moreover, when the Vee preparation angle was 45℃, 60℃ or 90℃, the restrained weldment had lower angular distortion than the unrestrained weldments. The single Vee preparation angle (amount of filler metal) in butt welding affected the angular distortion of the weldment. Without restraint, the angular distortion tended to increase with the single Vee preparation angle. Meanwhile, the angular distortion tended to decrease when the single Vee preparation angle was 60℃. Additionally, a restrained weldment had high angular distortion when the single Vee preparation angle was 0℃. Notably, the angular distortion tended to reduce with increasing single Vee preparation angle. The angular distortion of the weldment was minimized at an angle of 60℃. However, the angular distortion increased when the Vee preparation angle exceeded 60℃. The high-temperature yield strength of a material also affected its angular distortion. Angular distortion increased with high-temperature yield strength. Experimental results also showed that, from the strongest to the weakest, the high-temperature yield strength of the three types of aluminum alloys followed the order 6061-T6 and 2024-T351>7075-T6.

关键词: Angular distortion , null , null

对P92钢C-曲线的评价

段宝玉 , 刘宗昌 , 任慧平 , 霍文霞

兵器材料科学与工程

研究P91、P92钢的过冷奥氏体转变具有重要理论意义和工程应用价值.汇总了P91、P92钢的CCT图和TTT图,对这些C-曲线进行分析和评价,指出存在的缺点,展示了P92钢的新的TTT图.P92钢的等温转变组织形貌较为特殊:珠光体组织为纤维状,下贝氏体呈颗粒状.

关键词: P91钢 , P92钢 , CCT图 , TTT图 , 珠光体 , 贝氏体

P2O5对C6A4MS-C2S-C4AF系中β-C2S稳定作用研究

马德伟 , 杨利群 , 徐先宇

材料科学与工程学报 doi:10.3969/j.issn.1673-2812.2001.02.020

本文研究了C6A4MS-C2S-C4AF系中R2O5对β-C2S的稳定性问题.结果表明:P2O5的掺入能有效抑制β-C2S转变为γ-C2S,稳定β-C2S;少量P2O5对C6A4MS的形成无抑制作用.

关键词: P2O5 , C6A4MS-C2S-C4AF系统 , β-C2S稳定

Surface oxidation of molten Sn-0.07 wt% P in air at 280 degrees C

Journal of Materials Research

In this article, we describe oxidation of molten Sn-0.07 wt% P alloy exposed in air at 280 degrees C. Although oxidation can be effectively reduced by the addition of trace phosphorus, the oxide film has a poor protection for the molten alloy with a high P concentration. The oxide film was analyzed by x-ray photoelectron spectroscopy. Comparing the results with the low P sample, there was a high phosphorous content in the film and a new Sn-P compound on the surface of the high P sample. It is assumed that the poor protection against oxidation of the film could be due to volatility of phosphorus in the Sn-P alloy at the temperature.

关键词: sn

C/C复合材料石墨化度P1模型的表征及测定

张赟 , 邓海金 , 李明 , 李东生 , 姜海

材料工程 doi:10.3969/j.issn.1001-4381.2001.04.008

C/C复合材料的石墨化度反映了材料中碳结构与理想石墨晶体结构的接近程度，并且是影响其性能的一个重要结构参数。石墨化度P1是一种能够比较准确地表示碳材料石墨程度结构的参数。本文利用P1的基本模型，编制了相应的计算程序，通过X光衍射（XRD）分析，计算了不同热处理温度C/C复合材料石墨化度P1，结果表明它可以较好的表征C/C复合材料的石墨化程度。并进一步讨论了热处理温度（HTT）与石墨化度的关系。

关键词: C/C复合材料 , 石墨化度

The effect of C-Al (Ga) codoping on p-type tendency in zinc oxide by first-principles

Optical Materials

The electronic structures of C, C-Al and C-Ga doped ZnO were investigated from the first-principles based on density functional theory (DFT). It was found that the C-doped ZnO where 1/8 Os are substituted by C is p-type with hole carriers locating nearby valence band maximum. Moreover, the Madelung energy increases in this case. Incorporating the reactive donor Al or Ga into C-doped ZnO system at Zn sites, not only enhances the C acceptor concentration, but also gets a shallower C acceptor energy level in the band gap in p-type codoped ZnO crystals and decreases the Madelung energy. (c) 2009 Elsevier B.V. All rights reserved.

关键词: Codoping;First-principles;ZnO;Electronic structures;zno

电沉积RE-Ni-W-P-B4C-PTFE

郭忠诚 , 陈凌 , 杨显万 , 翟大成

电镀与涂饰 doi:10.3969/j.issn.1004-227X.2000.03.001

研究了RE-Ni-W-P-B4C-PTFE复合镀层的性能.结果表明:热处理温度对RE-Ni-W-P-B4C-PTFE复合镀层的硬度影响很大,当温度达到400℃时,复合镀层的硬度达到极大值(1145 Hv);在同一热处理温度下,当保温时间达到3小时,镀层的硬度值最佳.当热处理温度达到300℃时,RE-Ni-W-P-B4C-PTFE复合镀层的耐磨性最好.高温氧化试验表明:RE-Ni-W-P-B4C-PTFE复合镀层随氧化时间和温度的延长,被氧化的程度增加.

关键词: 电沉积 , RE-Ni-W-P-B4C-PTFE复合镀层 , 性能

MAGNETIC PROPERTIES AND STRUCTURES OF NANO-CRYSTALLINE Fe-P-C-Mo-Cu-Si ALLOYS

Y.F. Gao , J.Tan , G.D. Liu , C.L.Zhang , T.Liuand R.Z Ma (Rapidly Quenched Materials Research and Development Centre , Central Iron & Steel Research Institute , Beijing 100081 , China)(Metal Physics Department , University of Science and Technology Beijing , Beijing 100083 , China)

金属学报(英文版)

A mostly single bcc phase with grain sizes of 15-20 nm was prepared by crystallization of amorphous Fe-P-C-Mo-Cu-Si alloys.The Bs value (H=10000 Oe) reaches 1.595 T for Fe(79.5) P(12)C6Cu(0.5)Mo(0.5)Si(1.5) alloys. The low core loss of 0.14 w/kg at 1.3 T and 50 Hz was confirmed for the bcc Fe(79.5)P(12)C6Cu(0.5)Mo(0.5)Si(1.5) alloy.The structures of the alloy annealed at different temperatures have been investigated by means of Xray diffraction and transmission electron microscope. The relationship between the structure and magnetic properties of the alloy is discussed.

关键词: : amorphous alloy , null , null

Fe70Cr10P13C7合金激光非晶化研究

杨永强 , 阎毓禾 , 王茂才

腐蚀学报（英文）

Fe70Cr10P13C7是一种可形成非晶态的合金,它除具有比一般结构钢高得多的断裂强度外,还具有特别突出的耐腐蚀性能。用2～5kw连续波CO2激光在40Cr钢基体上首先获得晶态的Fe70Cr10P13C7宽带熔覆层,而后获得多道搭接的厚约0.2mm的非晶层。该非晶层动电位极化曲线表明,非晶态Fe70Cr10P13C7的耐腐蚀性高于1Cr18Ni9Ti不锈钢和加Cr的Ni-Nb非晶合金。

关键词: 激光非晶化 , Fe70Cr10P13C7 alloy , corrosion resistance