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Mn合金化对电缆用8076铝合金性能的影响
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作者 黄金磊 赵毅飞 郝敏钗 《铸造技术》 CAS 北大核心 2017年第2期318-320,共3页
在8076铝合金中添加不同含量的Mn,考察了Mn含量对铸态合金显微组织、物相组成、电导率和力学性能的影响。结果表明,Mn的加入使得8076合金中形成了Al Fe Si Mn相,晶界处的共晶化合物从长条状转变为短棒状;随着Mn含量增加,合金的电导率和... 在8076铝合金中添加不同含量的Mn,考察了Mn含量对铸态合金显微组织、物相组成、电导率和力学性能的影响。结果表明,Mn的加入使得8076合金中形成了Al Fe Si Mn相,晶界处的共晶化合物从长条状转变为短棒状;随着Mn含量增加,合金的电导率和断后伸长率逐渐降低,而抗拉强度逐渐升高。 展开更多
关键词 8076合金 电力电缆 mn合金化
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铁路货车制动梁用微合金化钢15Mn2CrVNbE的试制 被引量:5
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作者 杨卫中 周德光 +2 位作者 唐建国 张娜 肖静 《特殊钢》 北大核心 2006年第6期59-60,共2页
首钢三炼钢厂采用铁水脱硫-80tLD冶炼-LF(喂丝)精炼-4流方坯连铸工艺生产制动梁用微合金化钢15Mn2CrVNbE(%:0.13~0.17C、1.44~1.59Mn、0.30~0.60Cr、0.02~0.10V、0.02~0.05Nb、0.02~0.05Al)。通过控制钢中Al含量、吹氩、喂硅钙线... 首钢三炼钢厂采用铁水脱硫-80tLD冶炼-LF(喂丝)精炼-4流方坯连铸工艺生产制动梁用微合金化钢15Mn2CrVNbE(%:0.13~0.17C、1.44~1.59Mn、0.30~0.60Cr、0.02~0.10V、0.02~0.05Nb、0.02~0.05Al)。通过控制钢中Al含量、吹氩、喂硅钙线和全程保护浇铸等工艺措施,149炉生产结果表明,铸坯中氧含量为(7~26)×10-6,氮含量为(29~79)×10-6。制动梁成品的力学性能为σs465~575MPa,σb630~720MPa,δ525%~34%,-40℃纵向冲击功36~183J,满足使用要求。 展开更多
关键词 合金化钢15mn2CrVNbE 制动梁 LD—LF工艺
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添加Mn、Ni对ZA27合金组织与性能的影响 被引量:12
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作者 逯允海 赵品 沈焕祥 《中国有色金属学报》 EI CAS CSCD 北大核心 2005年第12期1960-1967,共8页
研究了添加Mn、Ni对ZA27合金组织和性能的影响。结果表明:适量Mn、Ni的添加在不明显降低室温强度的条件下,显著提高了合金的高温性能;同时添加质量分数为0.5%Mn和0.5%Ni使铸态ZA27合金非平衡网状三相共晶中出现大量富镍相粒子,在250℃... 研究了添加Mn、Ni对ZA27合金组织和性能的影响。结果表明:适量Mn、Ni的添加在不明显降低室温强度的条件下,显著提高了合金的高温性能;同时添加质量分数为0.5%Mn和0.5%Ni使铸态ZA27合金非平衡网状三相共晶中出现大量富镍相粒子,在250℃、拉伸机横梁移动速率为100 mm/min条件下的瞬时抗拉强度27.2 MPa比未加Mn、Ni的合金提高46%;Mn、Ni的添加使280℃、初始应变速率6.67×10-2s-1条件下的超塑性拉伸的稳态流变应力由12.4 MPa提高到24.6 MPa,比未加Mn、Ni的合金提高98%。扫描电镜观察与X射线能谱分析表明,Mn、Ni显著提高超塑性拉伸的稳态流变应力的主要原因与“离位析出”富含Cu、Ni、Mn的粒子有关。 展开更多
关键词 ZA27合金 mn—Ni合金化 超塑性 力学性能
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Mn微合金化对Ti-Al-Mo-Zr-Fe-B合金组织演变和力学性能的影响
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作者 何苗霞 燕迟 +2 位作者 董月成 常辉 Alexandrov Igor V 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2024年第6期1555-1565,共11页
通过OM、EBSD和TEM等研究了Mn微合金化对新型近αTi-Al-Mo-Zr-Fe-B合金微观组织和力学性能的影响。结果表明:添加0.5%(质量分数)的Mn元素可以将合金的铸态微观组织从3.28μm细化到2.65μm,使其抗拉伸强度从882 MPa提高到966 MPa,但延伸... 通过OM、EBSD和TEM等研究了Mn微合金化对新型近αTi-Al-Mo-Zr-Fe-B合金微观组织和力学性能的影响。结果表明:添加0.5%(质量分数)的Mn元素可以将合金的铸态微观组织从3.28μm细化到2.65μm,使其抗拉伸强度从882 MPa提高到966 MPa,但延伸率从7.8%下降到5.1%。锻造后的2种合金的晶粒尺寸趋于一致,微观组织趋于等轴化且Mn微合金化后的组织更加均匀。锻造后,Ti-Al-Mo-Zr-Fe-B合金的抗拉伸强度和延伸率增加到966 MPa和16.4%,而含有0.5%(质量分数)Mn元素的合金具有更高的抗拉伸强度,达到了1079 MPa,同时延伸率达到了15.8%。结论表明,强度的提高可以归因于Mn元素的固溶强化效应,同时Mn微合金化处理使合金中的Al元素富集于α相,有利于提高合金的强度和塑性。 展开更多
关键词 mn合金化 近Α钛合金 组织演变 力学性能
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Effects ofslip mode on microstructure evolution and compressive flow behavior of extruded dilute Mg−0.5Bi−0.5Sn−0.5Mn alloy
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作者 Zhi-yong YOU Wei-li CHENG +6 位作者 Guo-lei LIU Jian LI Li-fei WANG Hui YU Hong-xia WANG Ze-qin CUI Jin-hui WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第11期3599-3614,共16页
The influence of the slip mode on the microstructure evolution and compressive flow behavior at different strains in an extruded dilute Mg−0.5Bi−0.5Sn−0.5Mn alloy was analyzed through electron backscatter diffraction,... The influence of the slip mode on the microstructure evolution and compressive flow behavior at different strains in an extruded dilute Mg−0.5Bi−0.5Sn−0.5Mn alloy was analyzed through electron backscatter diffraction,X-ray diffraction,transmission electron microscopy,and hot compression tests.The results showed that at a low strain of 0.05,the basal,pyramidaland<c+a>slip modes were simultaneously activated.Nevertheless,at the middle stage of deformation(strain of 0.1,0.2 and 0.5),theslip mode was difficult to be activated and<c+a>slip mode became dominant.The deformation process between strains of 0.2 and 0.5 was primarily characterized by the softening effect resulting from the simultaneous occurrence of continuous dynamic recrystallization and discontinuous dynamic recrystallization.Ultimately,at strain of 0.8,a dynamic equilibrium was established,with the flow stress remaining constant due to the interplay between the dynamic softening brought about by discontinuous dynamic recrystallization and the work-hardening effect induced by the activation of the basalslip mode. 展开更多
关键词 dilute Mg−Bi−Sn−mn alloy slip mode hot compression flow behavior dynamic recrystallization
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Crack elimination and strength enhancement mechanisms of selective laser melted Si-modified Al−Mn−Mg−Er−Zr alloy
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作者 Jiang YU Yao-xiang GENG +2 位作者 Hong-bo JU Zhi-jie ZHANG Jun-hua XU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2431-2441,共11页
In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al−Mn−Mg−Er−Zr alloy,a novel Si-modified Al−Mn−Mg−Er−Zr alloy was designed.The effect of Si alloying on the sur... In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al−Mn−Mg−Er−Zr alloy,a novel Si-modified Al−Mn−Mg−Er−Zr alloy was designed.The effect of Si alloying on the surface quality,processability,microstructure,and mechanical properties of the SLM-fabricated alloy was studied.The results showed that introducing Si into the Al−Mn−Mg−Er−Zr alloy prevented balling and keyhole formation,refined the grain size,and reduced the solidification temperature,which eliminated cracks and increased the processability and process window of the alloy.The maximum relative density of the SLM-fabricated Si/Al−Mn−Mg−Er−Zr alloy reached 99.6%.The yield strength and ultimate tensile strength of the alloy were(371±7)MPa and(518±6)MPa,respectively.These values were higher than those of the SLM-fabricated Al−Mn−Mg−Er−Zr and other Sc-free Al−Mg-based alloys. 展开更多
关键词 selective laser melting Al−mn−Mg−Er−Zr−Si alloy surface roughness PROCESSABILITY mechanical properties
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Microstructural evolution during homogenization of Al-Cu-Li-Mn-Zr-Ti alloy 被引量:17
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作者 李红英 苏雄杰 +1 位作者 尹浩 黄德胜 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第9期2543-2550,共8页
The microstructure evolution of Al-Cu-Li-Mn-Zr-Ti alloy during homogenization was investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), and diff... The microstructure evolution of Al-Cu-Li-Mn-Zr-Ti alloy during homogenization was investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), and differential scanning calorimeter (DSC) methods. The results show that severe dendritic segregation exists in the experimental alloy ingot. Numerous eutectic phases can be observed in the grain boundary, and the distribution of the main elements along the interdendritic region varies periodically. The main secondary phase is Al2Cu. The overburnt temperature of the alloy is 520 °C. The second phases are gradually dissolved into the matrix, and the grain boundaries become spare and thin during homogenization with increasing temperature or prolonging holding time. Homogenization can be described by a constitutive equation in exponential function. The suitable homogenization treatment for the alloy is (510 °C, 18 h), which agrees well with the results of homogenization kinetic analysis. 展开更多
关键词 Al-Cu-Li-mn-Zr-Ti alloy HOMOGENIZATION microstructure kinetics
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Microstructure evolution and mechanical properties of Mg-x%Zn-1%Mn(x=4,5,6,7,8,9) wrought magnesium alloys 被引量:10
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作者 张丁非 石国梁 +1 位作者 赵霞兵 齐福刚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第1期15-25,共11页
The roles of Zn content and thermo-mechanical treatment in affecting microstructures and mechanical properties of Mg-x%Zn-1%Mn(mass fraction,x=4,5,6,7,8,9) wrought Mg alloys were investigated.The microstructure was ... The roles of Zn content and thermo-mechanical treatment in affecting microstructures and mechanical properties of Mg-x%Zn-1%Mn(mass fraction,x=4,5,6,7,8,9) wrought Mg alloys were investigated.The microstructure was extremely refined by dynamic recrystallization(DRC) during extrusion.With increasing Zn content,the DRC grains tended to grow up,at the same time,more second phase streamlines would be present,which restricted the further growing.During solution treatment,the DRC grains would rapidly grow up;however,higher Zn content could hinder the grain boundary expanding,which results in finer ultimate grains.MgZn2 dispersoid particles which are coherent with the matrix would precipitate from the supersaturated solid solution during the one-step aging process,and nano-sized GP zones formed during the pre-aging stage of the two-step aging provide a huge amount of effective nuclei for the MgZn2 phases formed in the second stage,which makes the MgZn2 particles much finer and more dispersed.The mechanical properties of as-extruded samples were not so sensitive to the variation of Zn content,the tensile strength fluctuates between 300 and 320 MPa,and the elongation maintains a high value between 11% and 14%.The strength of aged samples rises as a parabolic curve with increasing Zn content,specifically,the tensile strength of one-step aged samples rises from 278 to 374 MPa,and that of two-step aged ones rises from 284 to 378 MPa,yet the elongation of all aged samples is below 8%.When Zn content exceeds its solid solution limit in Mg-Zn system(6.2%,mass fraction),the strength rises slowly but the elongation deteriorates sharply,so a Mg-Zn-Mn alloy with 6% Zn possesses the best mechanical properties,that is,the tensile strengths after one-and two-step aging are 352 and 366 MPa,respectively,and the corresponding elongations are 7.98% and 5.2%,respectively. 展开更多
关键词 Mg-Zn-mn alloy two-step aging AGE-HARDENING Zn content
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Enhanced mechanical properties and formability of hot-rolled Mg-Zn-Mn alloy by Ca and Sm alloying 被引量:6
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作者 Wen-xue FAN Yu BAI +2 位作者 Guang-yang LI Xing-yang CHANG Hai HAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第4期1119-1132,共14页
In order to broaden the application of wrought Mg alloy sheets in the automotive industry,the influence of Ca and Sm alloying on the texture evolution,mechanical properties,and formability of a hot-rolled Mg-2Zn-0.2Mn... In order to broaden the application of wrought Mg alloy sheets in the automotive industry,the influence of Ca and Sm alloying on the texture evolution,mechanical properties,and formability of a hot-rolled Mg-2Zn-0.2Mn alloy was investigated by OM,XRD,SEM,EBSD,tensile tests,and Erichsen test.The results showed that the average grain size and basal texture intensity of Mg-2Zn-0.2Mn alloys were remarkably decreased after Ca and Sm additions.0.64 wt.%Ca or 0.48 wt.%Sm addition significantly increased the tensile strength,ductility and formability.Moreover,the synergetic addition of Sm and Ca improved the ductility and formability of Mg-2Zn-0.2Mn alloy,which was due to the change of Ca distribution and further reduction of the size of Ca-containing particles by Sm addition.The results provided a possibility of replacing RE elements with Ca and Sm in Mg alloys which bring about outstanding mechanical properties and formability. 展开更多
关键词 Mg-Zn-mn alloy micro-alloying hot rolling texture evolution FORMABILITY
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Effect of homogenization treatment on microstructure and properties of Al-Mg-Mn-Sc-Zr alloy 被引量:8
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作者 聂波 尹志民 +3 位作者 朱大鹏 彭勇宜 姜锋 黄继武 《Journal of Central South University of Technology》 2007年第4期452-455,共4页
The effect of homogenization on the hardness,tensile properties,electrical conductivity and microstructure of as-cast Al-6Mg-0.4Mn-0.25Sc-0.12Zr alloy was studied.The results show that during homogenization as-cast st... The effect of homogenization on the hardness,tensile properties,electrical conductivity and microstructure of as-cast Al-6Mg-0.4Mn-0.25Sc-0.12Zr alloy was studied.The results show that during homogenization as-cast studied alloy has obviously hardening effect that is similar to aging hardening behavior in traditional Al alloys.The precipitates are mainly Al3(Sc,Zr)and Al6Mn.When homogenization temperature increases the hardness peak value is declined and the time corresponding to hardness peak value is shortened.The electrical conductivity of the alloy monotonously increases with increasing homogenization temperature and time.The decomposition of the supersaturated solid solution containing Sc and Zr which is formed during direct chilling casting and the precipitation of Al3(Sc,Zr)cause hardness increasing.The depletion of the matrix solid solubility decreases the ability of electron scattering in the alloy,resulting in the electrical conductivity increased.Tensile property result at hot rolling state shows that the optimal homogenization treatment processing is holding at 300-350 ℃ for 6-8 h. 展开更多
关键词 SC ZR Al-Mg-mn alloy HOMOGENIZATION Al3(Sc Zr) precipitation MICROSTRUCTURES tensile properties HARDNESS
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Mn含量对Ti_(53)Al_(45)Nb_(2)合金组织和力学性能影响
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作者 况侨 吴鑫林 +1 位作者 张海龙 王强 《特种铸造及有色合金》 CAS 北大核心 2024年第10期1398-1402,共5页
采用金相显微镜、X射线衍射仪、拉伸试验机、扫面电镜等手段研究了Mn含量对TiAl合金微观组织和力学性能的影响。结果表明,Ti_(53-x)Al_(45)Nb_(2)Mn_(x)(x=0、1、2.5、4,摩尔分数,%)合金的组成相包括γ-TiAl相和α_(2)-Ti_(3)Al相,添加... 采用金相显微镜、X射线衍射仪、拉伸试验机、扫面电镜等手段研究了Mn含量对TiAl合金微观组织和力学性能的影响。结果表明,Ti_(53-x)Al_(45)Nb_(2)Mn_(x)(x=0、1、2.5、4,摩尔分数,%)合金的组成相包括γ-TiAl相和α_(2)-Ti_(3)Al相,添加的Mn元素以固溶原子的形式固溶于合金基体中,引起晶格畸变,导致晶面间距变大。随着x从0增至1,2.5,4,合金片层结构显著细化,片层厚度由(670±120)nm分别降到(610±90)、(580±100)和(540±90)nm。合金的室温压缩屈服强度、抗压强度和断裂应变均随着Mn含量增加先增大后减小,Ti_(51.5)Al_(45)Nb_(2)Mn_(2.5)合金性能最佳,分别达到了930 MPa、1605 MPa和30.4%。相较于未添加Mn的合金,分别提高了32.9%、35.4%和83.1%。 展开更多
关键词 TIAL合金 mn合金化 微观组织 力学性能
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Isothermal annealing of cold-rolled Al-Mn-Fe-Si alloy with different microchemistry states 被引量:2
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作者 黄科 李彦军 Knut MARTHINSEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第12期3840-3847,共8页
Microstructural evolution of a cold-rolled Al-Mn-Fe-Si alloy during annealing was studied. Except the as-cast variant, two other different homogenizations were considered, one gave a high density of fine dispersiods p... Microstructural evolution of a cold-rolled Al-Mn-Fe-Si alloy during annealing was studied. Except the as-cast variant, two other different homogenizations were considered, one gave a high density of fine dispersiods providing a considerable Zener drag influencing the softening behavior while the other gave a lower density of coarser dispersoid structure providing a much smaller drag effect. The gradual microstructural evolutions during annealing for the three variants were captured by interrupting annealing at different time. Effects of microchemistry state on recrystallization kinetics, recrystallized grain structure and texture were characterized by EBSD. It is demonstrated that the actual softening kinetics, final microstructure and texture are a result of delicate balance between processing condition and microchemistry state. Strong concurrent precipitation takes place in the case with high concentration of Mn in solid solution, which suppresses nucleation and retards recrystallization and finally leads to grain structure of coarse elongated grains dominated by a P texture component together with a ND-rotated cube component. On the contrary, when solute content of Mn is low and pre-existing dispersoids are relatively coarser, faster recrystallization kinetics is exhibited together with an equiaxed grain structure with mainly cube texture. 展开更多
关键词 aluminum alloy Al-mn-Fe-Si alloy recrystallization kinetics MICROCHEMISTRY PRECIPITATION recrystallization texture
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海洋平台用钢的研发生产现状与发展趋势 被引量:46
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作者 刘振宇 唐帅 +2 位作者 陈俊 叶其斌 王国栋 《鞍钢技术》 CAS 2015年第1期1-7,共7页
介绍了国内外海洋平台用钢发展现状,总结出海洋平台用钢生产的主要特点,对传统海洋平台用钢的成分、工艺、组织、性能特征及其局限性进行了分析,提出了开发"Mn/C"合金化新型高强韧海洋平台用钢的发展思路,对海洋平台用钢今后... 介绍了国内外海洋平台用钢发展现状,总结出海洋平台用钢生产的主要特点,对传统海洋平台用钢的成分、工艺、组织、性能特征及其局限性进行了分析,提出了开发"Mn/C"合金化新型高强韧海洋平台用钢的发展思路,对海洋平台用钢今后的发展趋势加以展望。鉴于我国高级别海洋工程用钢与国外相比仍存在一定的差距,关键产品还依赖于进口,今后应重点研制屈服强度为690 MPa级的海洋平台用高强韧钢。 展开更多
关键词 海洋平台用钢 mn/C”合金化 高强韧钢
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Grain refinement mechanism of Al-5C master alloy in AZ31 magnesium alloy 被引量:6
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作者 张爱民 郝海 张兴国 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第11期3167-3172,共6页
Al-5C master alloy was prepared by powder in situ synthesis process, and its effects on grain refinement of AZ31 alloy and refining mechanism were investigated. The results indicate that the AI 5C master alloy consist... Al-5C master alloy was prepared by powder in situ synthesis process, and its effects on grain refinement of AZ31 alloy and refining mechanism were investigated. The results indicate that the AI 5C master alloy consists of a(Al) and A14C3 phases, and the size distribution of Al4C3 particles is controlled by sintering time. The AI 5C master alloy can remarkably reduce the grain size of AZ31 alloy, which decreases with the increasing addition amount of AI-SC master alloy when the addition amount is below 2%. The refining mechanism is attributed to the formation of new compounds of Al-C-Mnparticles by Al4C3 and Mn, which might act as nucleating substrates for a-Mg grain. 展开更多
关键词 AZ31 magnesium alloy grain refinement AI-SC master alloy AI C mn compounds
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Electrochemical hydrogen storage characteristics of nanocrystalline and amorphous Mg_2Ni-type alloys prepared by melt-spinning 被引量:4
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作者 张羊换 吕科 +3 位作者 赵栋梁 郭世海 祁焱 王新林 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第3期502-511,共10页
The nanocrystalline and amorphous Mg2Ni-type alloys with nominal compositions of Mg2Ni1-xMnx (x=0, 0.1, 0.2, 0.3, 0.4) were synthesized by melt-spinning technique. The spun alloy ribbons with a continuous length, a ... The nanocrystalline and amorphous Mg2Ni-type alloys with nominal compositions of Mg2Ni1-xMnx (x=0, 0.1, 0.2, 0.3, 0.4) were synthesized by melt-spinning technique. The spun alloy ribbons with a continuous length, a thickness of about 30 μm and a width of about 25 mm are obtained. The structures of the as-spun alloy ribbons were characterized by XRD and HRTEM. The electrochemical hydrogen storage characteristics of the as-spun alloy ribbons were measured by an automatic galvanostatic system. The electrochemical impedance spectrums (EIS) were plotted by an electrochemical workstation. The hydrogen diffusion coefficients (D) in the alloys were calculated by virtue of potential-step measurement. The results show that all the as-spun (x=0) alloys hold a typical nanocrystalline structure, whereas the as-spun (x=0.4) alloy displays a nanocrystalline and amorphous structure, confirming that the substitution of Mn for Ni facilitates the glass formation in the Mg2Ni-type alloy. The substitution of Mn for Ni significantly improves the electrochemical hydrogen storage performances of the alloys, involving the discharge capacity and the electrochemical cycle stability. With an increase in the amount of Mn substitution from 0 to 0.4, the discharge capacity of the as-spun (20 m/s) alloy increases from 96.5 to 265.3 mA·h/g, and its capacity retaining rate (S20) at the 20th cycle increases from 31.3% to 70.2%. Furthermore, the high rate dischargeability (HRD), electrochemical impedance spectrum and potential-step measurements all indicate that the electrochemical kinetics of the alloy electrodes first increases then decreases with raising the amount of Mn substitution. 展开更多
关键词 Mg2Ni-type alloy electrochemical hydrogen storage MELT-SPINNING substituting Ni with mn
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Effects of solute supersaturation and re-precipitation on microstructure and mechanical properties of selective laser melted Al−Mn−Mg−Sc−Zr alloys
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作者 Ying DENG Yi LAI +4 位作者 Jia-shun CHEN Yuan-hao XU Jun-chang CAO Rui-yin HUANG Jia-qi DUAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS 2024年第12期3846-3861,共16页
A new Al−4.87Mn−1.42Mg−0.63Sc−0.20Zr(wt.%)alloy was fabricated by selective laser melting(SLM)and its microstructure and mechanical properties before and after aging were investigated.The results show that at a laser ... A new Al−4.87Mn−1.42Mg−0.63Sc−0.20Zr(wt.%)alloy was fabricated by selective laser melting(SLM)and its microstructure and mechanical properties before and after aging were investigated.The results show that at a laser power input of 300 W,increasing laser scanning speeds from 700 to 1500 mm/s improves the mechanical properties.In the meantime,the lattice distortion values increase from 0.15%to 0.31%,showing an increasing solute supersaturation.At a laser scanning speed of 1500 mm/s,the yield strength,ultimate tensile strength and elongation of the as-SLM alloys are 356 MPa,412 MPa and 17.7%,respectively.After aging at 350°C for 8 h,these values increase to 527 MPa,554 MPa and 10.4%,respectively.The contributions to the yield strength increments from the secondary Al6(Fe,Mn)needle-like phase and re-precipitated L12 structured Al6(Sc,Zr,Ti)nano-particles during aging are 74 and 79 MPa,respectively.As the aging temperature increases to 450°C,the dominant precipitation strengthening is attributed to the secondary Al6(Sc,Zr,Ti)nano-particles. 展开更多
关键词 Al−mn−Mg alloy selective laser melting re-precipitation solute atom microstructure mechanical properties
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