共查询到20条相似文献,搜索用时 15 毫秒
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R.G. Faulkner 《金属学报(英文版)》2003,16(5):365-374
Irradiation-induced grain boundary segregation of solute atoms frequently bring about grain boundary precipitation of a second phase because of its making the solubility limit of the solute surpassed at grain boundaries. Until now the kinetic models for irradiation-induced grain boundary precipitation have been sparse. For this reason, we have theoretically treated grain boundary precipitation under irradiation in dilute binary alloys. Predictions of γ' -Ni3Si precipitation at grain boundaries are made for a dilute Ni-Si alloy subjected to irradiation. It is demonstrated that grain boundary silicon segregation under irradiation may lead to grain boundary γ'-Ni3Si precipitation over a certain temperature range. 相似文献
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ZHANG Sanhong HE Xinlai CHU Youyi~* KE Jun University of Science Technology Beijing Beijing China lecturer Department of Materials Physics University of Science Technology Beijing Beijing China 《金属学报(英文版)》1993,6(6):391-396
The behaviour of baron segregation at grain boundaries in Fe-3% Si has been studied bymeans of particle tracking autoradiography(PTA).The results indicate that the tendency ofequilibrium segregation of B at grain boundaries in Fe-3% Si is higher than that in austeniticalloys.No observable nonequilibrium segregation of B at grain boundaries was revealed inFe-3% Si alloy during cooling and isothermal holding.The binding energy between boron at-oms and grain boundaries is 55.7±1.7 kJ/mol.Based on the complex mechanism of B segre-gation of quenching-induce-nonequilibrium segregation,different behaviours of B segrega-tion in γ-Fe and bcc Fe-3% Si alloy were discussed. 相似文献
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奥氏体Fe-Mn合金的低温脆性 总被引:8,自引:0,他引:8
奥氏体型合金一般具有优良的低温韧性.本文对奥氏体Fe-Mn合金低温变脆现象进行了研究.实验结果肯定了低温下有冷脆倾向;指出随Mn含量增多,冷脆转变温度增高,呈沿晶脆断;发现Mn沿晶界偏聚,且Mn含量愈高偏析程度愈大;初步分析了晶界Mn富集造成冷脆的因素;未能证实前人提到的可能引起低温变脆的-100℃时面心立方→面心四方相变的存在. 相似文献
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HU Deqing ZHANG Zhaoxiang ZHAO Xingyu Peking University Beijing China ZHZNG Zhaoxiang Dept.of Radio Electronics Peking University Beijing China 《金属学报(英文版)》1990,3(8):125-130
The surface segregation in Mo-4wt-% La alloy wire has been studied by using Auger elec-tron spectroscopy.The process of the segregation is that the La atoms diffuse from the grainboundaries to surface.The experimental results were analysed by kinetics of grain boundarydiffusion.The diffusion activation energy E_(?)=1.6 eV was obtained. 相似文献
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JI Jingwen WEI Quanjin GENG Dianqi WU Yuqin Northeast University of Technology Shenyang China Professor Dept.of Physics Northeast University of Technology Shenyang China 《金属学报(英文版)》1990,3(4):243-248
The grain boundary internal friction(GBIF)in Fe-P and Fe-P-La alloys containing traceCu has been studied.It is found that an addition of 0.584—0.722 wt-% La obviously reducesthe IF,shifts grain boundary peaks towards higher temperatures,and produces a small addi-tional peak at even higher temperature.The mechanism of GBIF is explained as the movementof defects of atomic size,namely point defects,at gram boundaries and/or their clusters un-der stress. 相似文献
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Zr对Ni3Al晶界及力学性能的影响 总被引:4,自引:0,他引:4
对不同Zr含量Ni3Al的力学性能及晶界的研究结果表明:随Zr含量的增加,合金的屈服强度和抗张强度不断提高;当Zr≤0.7at.-%时,塑性随Zr含量的增加而提高;但Zr含量达1.2at.-%时,Zr的增塑效果下降.Auger能谱分析表明:Zr在晶界有偏聚,偏聚因子约为3.断口观察显示:不含Zr或Zr含量为1.2at.-%的Ni-24.0Al合金均为沿晶断裂,其余含Zr合金的断裂方式为穿晶、沿晶混合断裂.这表明:含Zr的Ni3Al塑性和Zr在晶界的偏聚有密切关系. 相似文献
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WU Zhichun Institute of Chemical Metallurgy Academia Siniea Beijing China WU Zhichun Assistant Professor Institute of Chemical Metallurgy Academia Sinica Beijing China 《金属学报(英文版)》1992,5(7):21-27
The diffusion coefficients of CuCl_2 in aqueous solutions of CuCl_2 and CuCl_2-HCl weremeasured respectively at 298 K with diaphragm cell method. The concentration dependenceof CuCl_2 diffusion coefficient in single CuCl_2 solutions and in mixed CuCl_2 -HCl solutionswas discussed on the changes in chemical potential as well as in viscosity. 相似文献
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氯化铜在水溶液中的扩散系数的测定SCIEI 总被引:2,自引:0,他引:2
用膈膜池法测定了298K条件下CuCl_2在CuCl_2和CuCl_2-HCl水溶液中的扩散系数。发现CuCl_2的扩散系数与其浓度依赖性主要取决于它的化学位和溶液的粘度。 相似文献
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YANG Zhenguo DU Weixi Jilin University of Technology Changchun ChinaDU Senlin LIU Sulan Changchun Institute of Applied Chemistry. Academia Sinica Changchun China 《金属学报(英文版)》1989,2(11):316-320
The diffusion coefficients of lanthnum in liquid Al-Si alloy have been measured successfullyby the anodic chronopotentiometry. At 973K, the diffusion coefficient of lanthanum(D_(La(Al-Si))) in liquid Al-5.2wt-%Si alloy equals (0.91±0.01)×10~(-5) cm~2 s~(-1) . In the rangeof temperatures 953-1053K, the relationship between the diffusion coefficient and the tem-perature is represented by 1gD_(La(Al-Si))=-1.78×10~(-3)-4909/T. The activation energy isQ=94.00kJ·mol~(-1). Using the diffusion data of lanthanum and strontium, the effect of thediffusion of the modifier on the incubation period of modification and cooling rate has beendiscussed. 相似文献
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QIU Yiming ZHU Yaoxiao Institute of Metal Research Academia Sinica Shenyang China Professor Institute of Metal Research Academia Sinica Shenyang China 《金属学报(英文版)》1989,2(4):308-310
An investigation was made on the possibility of using Ni-x phase diagrams to judge the sym-bol and degree of segregation of alloying element x in cast nickel-base superalloys.The pre-diction coincides with the experimental data. 相似文献
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镍基铸造高温合金中合金元素的偏析规律 总被引:1,自引:1,他引:1
研究了用Ni-x二元相图来判断镍基铸造高温合金中合金元素x处于正偏析、负偏析或者基本不偏析状态以及偏析严重程度的可能性,并用实验验证了正确性。 相似文献