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Electrochemical codeposition of Mg-Li-Gd alloys from LiCl-KCl-MgCl_2-Gd_2O_3 melts 被引量:4
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作者 魏树权 张密林 +3 位作者 韩伟 颜永得 张萌 张斌 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期825-829,共5页
Mg-Li-Gd alloys were prepared by electrochemical codeposition from LiCl-KCl-MgCl 2 -Gd 2 O 3 melts on molybdenum electrode with constant current density at 823 and 973 K. The microstructure of the Mg-Li-Gd alloys was ... Mg-Li-Gd alloys were prepared by electrochemical codeposition from LiCl-KCl-MgCl 2 -Gd 2 O 3 melts on molybdenum electrode with constant current density at 823 and 973 K. The microstructure of the Mg-Li-Gd alloys was analyzed by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The results show that magnesium and gadolinium deposit mainly in the first 30 min, and the alloy obtained contains 96.53% Mg, 0.27% Li and 3.20% Gd (mass fraction). Then, the reduction of lithium ions occurs quickly. The composition of alloy can be adjusted by controlling electrolysis time or Gd 2 O 3 concentration in LiCl-KCl melts. With the addition of Gd into Mg-Li alloys, the corrosion resistance of the alloys is enhanced. XRD results suggest that Mg 3 Gd and Mg 2 Gd can be formed in Mg-Li-Gd alloys. The distribution of Gd element in Mg-Li-Gd alloys indicates that Gd element mainly distributes at the grain boundaries of Mg-Li-Gd alloys. 展开更多
关键词 electrochemical codeposition Mg-Li-gd alloy chloride melt galvanostatic electrolysis gd2O3
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Effect of purification treatment on corrosion resistance of Mg-Gd-Y-Zr alloy 被引量:8
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作者 王杰 杨院生 童文辉 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第4期949-954,共6页
Mg-Gd-Y-Zr alloys were purified by filtering purification with and without vacuum. The type, morphology, size distribution and volume fraction of inclusion were analyzed with OM and SEM. The effect of inclusion in Mg-... Mg-Gd-Y-Zr alloys were purified by filtering purification with and without vacuum. The type, morphology, size distribution and volume fraction of inclusion were analyzed with OM and SEM. The effect of inclusion in Mg-Gd-Y-Zr alloys on anticorrosion ability was investigated with salt spray test and electrochemical test. The results show that the inclusions in the alloy can be removed effectively by filtering purification. The average size of inclusions in the alloys is decreased from 12.7 μm to 2.0 μm and the volume fraction of inclusions is reduced from 0.30% to 0.04%. With the decrease of the size of inclusions in the alloys, the corrosion rate of the alloys decreases dramatically from 38.8 g/(m 2 ·d) to 2.4 g/(m 2 ·d) in the salt spray test. The corrosion potential increases while the corrosion current decreases and the polarization resistance increases in the electrochemical tests, which indicates that the anticorrosion ability is improved. 展开更多
关键词 Mg-gd-Y-Zr alloy filtering purification INCLUSION corrosion rate polarization curve polarization resistance
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Microstructure and mechanical properties of extruded Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy 被引量:1
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作者 周浩 王渠东 +2 位作者 陈杰 叶兵 郭炜 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期1891-1895,共5页
The microstructure, age hardening behavior and mechanical properties of an Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy prepared by casting and hot extrusion techniques were investigated. The solution-treated (T4 temper) alloys ... The microstructure, age hardening behavior and mechanical properties of an Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy prepared by casting and hot extrusion techniques were investigated. The solution-treated (T4 temper) alloys were extruded at 400, 450 and 500 °C with an extrusion ratio of 10:1, respectively. Optimized mechanical properties were obtained by extrusion at 400 °C followed by T5 treatment under the combined effects of grain refinement and precipitation strengthening. The alloy exhibits a grain size of about 5.0 μm, initial and peak microhardness of HV 109 and HV 129, respectively. The tensile yield strength, ultimate tensile strength and elongation at room temperature are 391 MPa, 430 MPa and 5.2%, respectively. 展开更多
关键词 Mg-gd-Y-Ag-Zr alloy EXTRUSION age hardening microstructure mechanical property
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钆对B2型NiAl力学性质合金化效应的第一性原理计算
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作者 陈律 李敏 刘逸众 《中国稀土学报》 CAS CSCD 北大核心 2020年第4期514-520,I0003,共8页
采用第一性原理赝势平面波方法,基于虚拟晶体势函数近似(VCA),研究了Gd微合金化(x<1.0%,原子百分比,下同)对理想与包含点缺陷B2-NiAl晶体的弹性常数C44,Cauchy压力参数(C12-C44)、弹性模量E、剪切模量G及其与体模量B0的比值G/B0随Gd... 采用第一性原理赝势平面波方法,基于虚拟晶体势函数近似(VCA),研究了Gd微合金化(x<1.0%,原子百分比,下同)对理想与包含点缺陷B2-NiAl晶体的弹性常数C44,Cauchy压力参数(C12-C44)、弹性模量E、剪切模量G及其与体模量B0的比值G/B0随Gd合金化浓度x的影响。数据分析显示:无论Gd原子取代Ni原子位还是取代Al原子位,Gd微合金化能提高理想B2-NiAl晶体的硬度,同时也不利于其合金材料室温塑性的改善。微量Gd能与B2-NiAl多晶材料中的点缺陷协同作用,改善其合金的塑性,并以Gd原子取代Al位时效果明显,从而解释了实验研究中出现Gd微合金化能提高B2-NiAl合金压缩塑性的现象。 展开更多
关键词 B2-NiAl gd合金化 第一原理计算 VCA近似 弹性性质
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Effects of trace Ag on precipitation behavior and mechanical properties of extruded Mg−Gd−Y−Zr alloys 被引量:2
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作者 Dong-dong ZHANG Chu-ming LIU +2 位作者 Shu-nong JIANG Ying-chun WAN Zhi-yong CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第11期3394-3404,共11页
The effects of trace Ag element on the precipitation behaviors and mechanical properties of the Mg−7.5Gd−1.5Y−0.4Zr(wt.%)alloy by means of tensile test,X-ray diffractometry,scanning electron microscopy,electron backsc... The effects of trace Ag element on the precipitation behaviors and mechanical properties of the Mg−7.5Gd−1.5Y−0.4Zr(wt.%)alloy by means of tensile test,X-ray diffractometry,scanning electron microscopy,electron backscattered diffractometry,and scanning transmission electron microscopy.There is an unusual texture(á0001ñ//extrusion direction)in the extruded Mg−Gd−Y−Zr alloys containing 0.5 wt.%Ag.During the aging periods at 225℃,the addition of the trace Ag does not form new precipitates,just accelerates aging kinetics,and refinesβ′precipitates,thereby increasing the number density of theβ′precipitates by Ag-clusters.Moreover,the Mg−Gd−Y−Zr alloy containing 0.5 wt.%Ag shows the most excellent synergy of strength and plasticity(408 MPa of ultimate tensile strength,265 MPa of yield strength,and 12.9%of elongation to failure)after peak-aging. 展开更多
关键词 trace Ag Mg−gd−Y−Zr alloy β′phase precipitation strengthening
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Microstructure and mechanical properties of high strength Mg−15Gd−1Zn−0.4Zr alloy additive-manufactured by selective laser melting process 被引量:14
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作者 Peng-huai FU Nan-qing WANG +5 位作者 Hai-guang LIAO Wen-yu XU Li-ming PENG Juan CHEN Guo-qi HU Wen-jiang DING 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第7期1969-1978,共10页
In order to verify the feasibility of producing Mg−rare earth(RE)alloy by selective laser melting(SLM)process,the microstructure and mechanical properties of Mg−15Gd−1Zn−0.4Zr(wt.%)(GZ151K)alloy were investigated.The ... In order to verify the feasibility of producing Mg−rare earth(RE)alloy by selective laser melting(SLM)process,the microstructure and mechanical properties of Mg−15Gd−1Zn−0.4Zr(wt.%)(GZ151K)alloy were investigated.The results show that fine grains(~2μm),fine secondary phases and weak texture,were observed in the as-fabricated(SLMed)GZ151K Mg alloy.At room temperature,the SLMed GZ151K alloy has a yield strength(YS)of 345 MPa,ultimate tensile strength(UTS)of 368 MPa and elongation of 3.0%.After subsequent aging(200℃,64 h,T5 treatment),the YS,UTS and elongation of the SLMed-T5 alloy are 410 MPa,428 MPa and 3.4%,respectively,which are higher than those of the conventional cast-T6 alloy,especially with the YS increased by 122 MPa.The main strengthening mechanisms of the SLMed GZ151K alloy are fine grains,fine secondary phases and residual stress,while after T5 treatment,the YS of the alloy is further enhanced by precipitates. 展开更多
关键词 selective laser melting Mg−rare earth alloy grain refinement Mg−gd−Zn strengthening mechanism
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Effect of purification treatment on properties of Mg-Gd-Y-Zr alloy 被引量:6
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作者 王杰 周吉学 +1 位作者 童文辉 杨院生 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第7期1235-1239,共5页
Mg-Gd-Y-Zr alloy was purified by the method of filtering purification. The type, morphology, size distribution and volume fraction of inclusions in the alloy were analyzed using optical microscope and scanning electro... Mg-Gd-Y-Zr alloy was purified by the method of filtering purification. The type, morphology, size distribution and volume fraction of inclusions in the alloy were analyzed using optical microscope and scanning electron microscope, and the effects of the inclusions on the mechanical and corrosion properties of the alloy were investigated. The results indicate that the filtering purification method is effective to remove inclusions in the alloy. By the filtering purification method, the average size of inclusions in the alloy reduces from 12.7 μm to 4.3 μm and the average volume fraction of inclusions in the alloy reduces from 0.26% to 0.06%. The ultimate tensile strength, yield strength and elongation of the alloy are improved from 200 MPa, 156 MPa and 3.4% to 232 MPa, 167 MPa and 7.0%, respectively. The corrosion rate of the alloy decreases dramatically from 38.8g/(mLd) to 2.5 g/(mZ.d) in the salt spray test. 展开更多
关键词 Mg-gd-Y-Zr alloy purification treatment INCLUSION mechanical properties corrosion resistance
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Gd含量对Mg-4Y-2.5Nd-xGd-0.5Zr合金的凝固组织及力学性能的影响
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作者 潘俊霖 陈乐平 +1 位作者 周全 袁源平 《特种铸造及有色合金》 CAS 北大核心 2023年第9期1265-1269,共5页
以Mg-4Y-2.5Nd-xGd-0.5Zr合金为对象,采用SEM、XRD、EDS及万能拉伸试验机等手段,研究了0.5%~5%(质量分数)的Gd含量对合金凝固组织和力学性能的影响。结果表明,在0.5%~5%范围内,随着Gd含量增加,合金的晶粒尺寸呈先减小后增大、抗拉强度... 以Mg-4Y-2.5Nd-xGd-0.5Zr合金为对象,采用SEM、XRD、EDS及万能拉伸试验机等手段,研究了0.5%~5%(质量分数)的Gd含量对合金凝固组织和力学性能的影响。结果表明,在0.5%~5%范围内,随着Gd含量增加,合金的晶粒尺寸呈先减小后增大、抗拉强度先增大后减小的趋势。当Gd含量为2%时,合金的晶粒尺寸和抗拉强度分别为37.72μm和276.99 MPa,相较于Gd含量为0.5%时分别减小了42.6%和提高了37.5%。另外,伸长率则随Gd含量增加呈逐渐减小的趋势。 展开更多
关键词 Mg-4Y-2.5Nd-xgd-0.5Zr合金 gd合金化 凝固组织 力学性能
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