J.X. Li
,
X.H. Liu
,
G.D. Wang
金属学报(英文版)
Two kinds of cold rolling experiments, single cold rolling and double cold rolling, werecarried out on one titanium stabilized interstitial free (IF) steel that has been warmrolled at ferrite temperature. The main aim was to investigate the evolution of rollingand annealing textures from the well known behavior observed under single cold rollingcondition to the less understood double cold rolling by using orientation distributionfunction (ODF). In the twice cold rolled samples, the annealing texture comprises onlyfirst round of rolling. Accordingly both the once cold rolled sample and the twice coldrolled sample with heavy reduction in the first round of rolling have much complextexture components. They are related to the formation of initial {111} subgrain andthe priority growth of stable {111} nucleus.
关键词:
double rolling
,
null
,
null
,
null
,
null
刘叔仪
金属学报
<正> 作为固体脆性断裂判据的J积分,其数值与其积分路径无关,这在文献中叫“守恒性”。这个守恒性已被推广到塑性断裂,这到底有否根据?本文目的是作这个问题的证明。未用原作者的方法,但由两个旋度判据得到应力应变函数行列式给出的一些否定结论,希望这对J积分应用条件的了解有所助益。1.弹塑性J积分守恒的条件 J积分
关键词:
许天才
,
彭晓东
,
张玺
,
陈元芳
,
姜军伟
,
陈洁
功能材料
doi:10.3969/j.issn.1001-9731.2014.07.013
利用光学显微镜(OM)、扫描电子显微镜(SEM)、X 射线衍射仪(XRD)分析了 Li 元素对 Mg-x Li-3Al 合金组织的影响,并用电子万能试验机测试合金的拉伸性能.结果表明,Li 含量的变化可以明显改变合金的相组成.当 m (Li)<5.7%(质量分数)时合金由单一α-Mg 相组成;Li 含量在5.7%~10.3%(质量分数)之间时,合金为α-Mg+β-Li 双相;m (Li)>10.3%(质量分数)时合金为单一β-Li 相.合金的塑性随 Li 含量的升高而增加,铸态 LA113合金的延伸率高达37.36%,但挤压态下合金强度随 Li 含量升高而降低,挤压态 LA53合金具有最佳抗拉强度,达到263.28 MPa.当 Li 含量升高,合金中的第二相粒子会出现 Al12 Mg17转变为 LiMgAl2.
关键词:
镁锂合金
,
铸态
,
挤压态
,
微观组织
,
拉伸性能
朱杰武
,
柳永宁
,
许雁
,
冯耀荣
机械工程材料
doi:10.3969/j.issn.1000-3738.2005.06.007
在不同温度下测试了X70管线钢动态断裂韧度K1d、J1d和止裂韧度K1a以及夏氏V型缺口冲击韧度Ak,对三者的关系进行了分析.结果表明:温度和加载速率都对断裂韧度产生影响;加载速率变化引起的韧-脆断裂转变具有热激活特征,在热激活分析基础上,在应力强度因子速率K=15 MPa·m1/2s-1条件下,得出断裂韧度、止裂韧度和冲击韧度三者的关系:Ak=4.84×106T-2.8K1d(或K1a).可以用小试样Ak数据计算得到K1d和K1a.
关键词:
管线钢
,
断裂韧度
,
止裂韧度
,
韧-脆断裂转变
陈瑞福
,
王文继
无机材料学报
Li1+2x+yAlxNdyTi2-x-ySixP3-xO12 锂快离子导体(以下简称Al-Nd-Lisicon)可以用精选的天然高岭石Al4[Si4O10](OH)8为起始原料,经与Li2CO3、TiO2、NH4H2PO4进行高温(800~1000℃)固相反应约20h而制得.一个空间群属于R3c的固溶体导电相可在y=0.5,x≤0.3和y=1.0,x≤0.4的组成范围内发现.该相具有较好的电导性和较低的活化能.起始组成y=1.0,x=0.3的合成物具有最高的电导率,在400℃时;其电导率达到3.08×10-2S/cm,离子导电激活能为35.2kJ/mol.
关键词:
矿物快离子导体
,
null
,
null
Y.H. Wei
,
L.Q. Hu
,
L.S. Jian
,
L. Lu and B.S. Xu College of Materials Science and Engineering
,
Taiyuan University of Technology
,
Taiyuan 030024
,
China
金属学报(英文版)
Theinitialstageofagingtransformationin Al 2 27% Li 2 68 % Cu 0 11% Zr 0 13% Ceal loy at100℃wasstudied by meansof x ray diffraction.It wasconcludedthatordering of Liatom happens whenthealloyissolution treated andquenched, and beforetheformationofδ’ phasethereexitscontinuous phasetransformation processes, namely ordering ,spinodal de composition and both coexistence. Gunier Preston zone was not found in the aging process ofthestudied alloy.
关键词:
Al Li Cu Zr alloy
,
null
,
null
,
null
,
null
张玉荣
,
王文继
功能材料
以LiTi2(PO4)3为基以天然高岭石为起始原料,经高温固相反应(~900℃)制得了一系列新的锂快离子导体材料Li1+2x+ 2yAlxMgyTi2-x-ySixP3-xO1 2(以下简称Ti-Mg-Lisicon).系统的合成温度随x和y值的增大而降低.应用交流阻抗技术测定的电导率数据结果表明x=0.1,y=0.1的合成物的室温电导率最好为1.01×10-4S/cm,而400℃时x=0.1,y=0.3的合成物的电导率最大,为2.53×10-2S/cm.XRD分析结果表明在x=0.1,y≤0.8;x=0.2,y≤0.6的组成范围内均能得到空间群为R3c的合成物.
关键词:
锂快离子导体
,
Ti-Mg-Lisicon
,
高岭石
张玉荣
,
王文继
无机材料学报
doi:10.3321/j.issn:1000-324X.2001.01.019
以LiTi2(PO4)3为基以天然高岭石为起始原料,经高温固相反应(9501150C)制得了一系列锂快离子导体材料Li1+2x+yAlxYbyTi2-x-ySixP3-xO12(以下简称Al-Yb-Lisicon). 系统的合成温度随x和y值的增大而降低. 应用交流阻抗技术测定的电导率数据结果表明y=0.3,x=0.1的合成物的电导率最好,400C时电导率达2.4510-2S/cm,200400C内的电导激活能为38.3kJ/mol. XRD分析结果表明在y=0.3,x0.4及y=0.5,x0.3的组成范围内均能得到空间群为R3c的合成物.
关键词:
锂快离子导体
,
Al-Yb-Lisicon
,
高岭石
Journal of Alloys and Compounds
The formation of impurity Li(x)Ni(1-x)O when synthesizing spinel LiNi(0.5)Mn(1.5)O(4) using solid state reaction method, and its influence on the electrochemical properties of product LiNi(0.5)Mn(1.5)O(4) were studied. The secondary phase LixNi(1-x)O emerges at high temperature due to oxygen deficiency for LiNi(0.5)Mn(1.5)O(4) and partial reduction of Mn(4+) to Mn(3+) in LiNi(0.5)Mn(1.5)O(4). Annealing process can diminish oxygen deficiency and inhibit impurity Li(x)Ni(1-x)O. The impurity reduces the specific capacity of product, but it does not have obvious negative effect on cycle performance of product. The capacity of LiNi(0.5)Mn(1.5)O(4) that contains Li(x)Ni(1-x)O can deliver about 120 mAhg(-1). (C) 2011 Elsevier B.V. All rights reserved.
关键词:
Lithium ion batteries;LiNi(0.5)Mn(1.5)O(4);Impurity Li(x)Ni(1-x)O;Electrochemical properties;lithium batteries;rate capability;spinel;performance
任海伦
,
戴永年
,
姚耀春
,
李伟宏
无机材料学报
doi:10.3724/SP.J.1077.2006.00627
采用固相法合成锂离子正极材料尖晶石相Li1.02CoxCryMn2-x-yO4, 研究元素Co、Cr不同掺杂量对产物的结构、晶胞常数、电化学性能和电池内阻的影响. 分析表明, 掺杂少量的Co、Cr的LiMn2O4依然保持着尖晶石结构; 晶胞常数随掺杂量的增加而减小, 从而使尖晶石的比表面积增大, 有利于提高电池的初始容量; 并有效地抑制了充放电过程中的Jahn-Teller效应和Mn3+的歧化反应. 掺杂Co、Cr后Li1.02MnO4初始容量有所下降, 且随掺杂量增加而减小, 但能明显改善材料的循环性能.
关键词:
固相法
,
doping Cr and Co
,
electrochemical performance
,
AC impedance