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利用气氛电阻炉制备了AZ 31-xNd合金(x=0.05%,0.1%,0.2%,0.4%,0.6%),采用光学显微镜(OM)、扫描电子显微镜(SEM)和电子能谱分析仪(EDS)对不同Nd含量的实验合金进行了显微组织观察和分析,结果发现,Nd在AZ 31-xNd合金中形成了Al_3Nd和Mg_(12)Nd相,这些含Nd相导致AZ 31镁合金在凝固过程中的晶粒细化,从而提高了AZ 31镁合金的铸态室温力学性能,随着Nd含量的增加,合金的铸态室温抗拉强度极限和延伸率均先升高后降低. 相似文献
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The effects of precipitates on grain size and mechanical properties of as-cast AZ3 1-x%Nd magnesium alloy were investi- gated, and the affecting mechanism was also discussed. The results indicated that Al2Nd phase, AlllNd3 phase and a few AI-Mn-Nd-Fe phase were furmed when adding 0.38 wt.%-1.46 wt.% Nd into AZ31 melt, coarse AI2Nd transformed into Al11Nd3 gradually with the increasing of Nd content. Due to structure and size transformation and content increasing of AI-Nd phase, the grain size of AZ31-x% Nd alloy increased firstly, and then decreased with the increment of Nd content. After reaching a minimum value, once again it rose up, provided that Nd content was further increased. The tensile property reached its optimal value when the adding amount of Nd content was 1.05 wl.%, however, adding excessive amount of Nd deteriorated both ultimate strength and elongation ofAZ31 alloy. 相似文献
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铈对铸造镁合金AZ91D显微组织与力学性能的影响 总被引:12,自引:0,他引:12
利用光学金相显微镜OM和XRD分析了分别加入0.1%,0.3%,0.5%,0.7%和1.0%Ce的AZ91D合金显微组织和相组成,测试了室温力学性能和硬度。结果表明,加入一定量Ce后的AZ91D合金形成杆状化合物Al4Ce,被推移到生长界面,阻碍枝晶的自由生长,从而细化合金显微组织;Ce能提高AZ91D合金室温抗拉强度和硬度,而对其屈服强度和延伸率影响不大;加入0.7%Ce的AZ91D合金晶粒细化效果好,其综合力学性能比较理想。 相似文献
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通过OM、SEM及阿基米德法等手段,研究超声处理对AZ80镁合金凝固组织、密度和力学性能的影响。结果表明:610℃超声处理可以降低晶粒尺寸,减少枝晶数量。经过超声处理后,合金密度由1.770g/cm3升至1.805g/cm3,抗拉强度由138MPa升高到170.5MPa,延伸率由2.5%提高为4.0%。 相似文献
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采用XRD、OM和SEM手段研究了Sm(0~2.0%,质量分数,下同)对AZ61合金显微组织和力学性能的影响。结果表明,Sm优先与A1形成高熔点Al2Sm弥散相,细化合金显微组织,提高时效态合金室温抗拉强度和屈服强度。在研究范围内,加入1.5%Sm的合金力学性能最优。Sm可以通过细晶强化、Ramakrishnan强化和Gypen固溶强化机制对AZ61合金强度产生影响。 相似文献
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利用光学显微镜、X射线衍射和扫描电镜等分析研究含铈镁合金AZ91D(0.25%Ce、0.7%Ce、0.95%Ce)的显微组织,并对其力学性能进行了测试,同时与不含铈镁合金AZ91D进行了比较。结果表明,加入一定量Ce后的镁合金AZ91D形成杆状化合物Al4Ce,被推移到生长界面,阻碍枝晶的自由生长,从而细化合金显微组织;Ce能提高镁合金AZ91D抗拉强度和硬度,而对其屈服强度和延伸率影响不大;加入0.7%Ce的AZ91D镁合金晶粒细化效果和综合力学性能比较理想。 相似文献
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利用金相显微镜,X-射线衍射仪,SEM,EDA,数字显微硬度计和电子万能试验机,对采用传统覆盖剂和自制覆盖剂制备的AZ91镁合金的显微组织和力学性能进行了分析.结果表明,自制覆盖剂制备的AZ91合金,Mg17Al12相得到改善,晶内出现Al4C3形核质点,晶粒得到显著细化,抗拉强度、屈服强度和延伸率都得到较大的提高,综合性能是实验合金中最高的,且拉伸断口形貌呈现河流花样,韧窝较深,这与合金的组织更细小有关. 相似文献
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Nd in the form of powder or intermediate alloy was added to AZ31 wrought alloy. The as-obtained alloy was characterized and tested with respect to its microstructure and mechanical properties. The relationship between the microstructure, mechanical properties and tensile fracture mechanism were discussed, with relevant alloys as reference for comparison. Experimental results show that the same quantity of Nd was added into AZ31 in powder form or in intermediate alloy, the absorption rate of Nd reached only 10.8% for the former case and as high as 95% for the later case. Pure Nd powder was added, no new compound was detected, but it served as reductant and purified alloy melt, resulting in improving the tensile strength while Nd was added into AZ31 as Mg-Nd intermediate alloy. The compound Al2Nd and Mg12 Nd were formed in magnesium alloy, which were distributed in the matrix in the shapes of strip and particle, evidently refined the as-cast structure. The as-cast tensile strength (228MPa) of adding pure Nd powder approximated to the figure (245MPa) of adding Mg-Nd intermediate alloy. The tensile fracture mchanism of as-cast AZ31 transformed from cleavage fracture into quasi-cleavage fracture. 相似文献
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Effect of Yttrium and Cerium Addition on Microstructure and Mechanical Properties of AM50 Magnesium Alloy 总被引:11,自引:0,他引:11
To develop magnesium alloy with low cost, high strength and excellent elevated temperature properties, effect of Y and Ce addition on microstructure and mechanical properties of AM50 magnesium alloy was studied. Result showed that addition of small amount of Y and Ce to AM50 alloys resulted in refinement of microstructure. Owing to the improvement of microstructure, the mechanical properties of alloys at both ambient and elevated temperature were increased. AM50 alloy containing 0.6 % Ce-0.3 % Y (mass fraction) had good refinement effect and relatively ideal mechanical properties. 相似文献
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Effect of ErCl_3 Addition on Microstructures and Properties of AZ91 Magnesium Alloy 相似文献
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稀土元素Sm对Mg-Zn-Y合金组织结构和力学性能的影响 总被引:1,自引:0,他引:1
制备了Mg-6Zn-1.5Y-0.8Zr-xSm(x=0,1,2,3)系列合金,研究了稀土元素Sm对Mg-6Zn-1.5Y-0.8Zr合金组织结构和力学性能的影响.通过金相显微镜、扫描电镜、EDS、XRD等观察和分析了合金的微观形貌和组织结构,测量了合金抗拉强度、屈服强度和伸长率等力学性能.结果表明:合金中添加稀土元素Sm后晶粒有了明显的细化,随着Sm元素含量的增加,晶粒细化效果更为明显;通过XRD分析,添加Sm元素后,合金中并没有出现新的含Sm的物相,通过扫描电镜和EDS分析表明,合金中加入的Sm置换了部分Y,形成了Mg3( SmY)2 Zn3,Mg3( SmY) Zn6的相结构,Sm元素对Y的置换主要出现在Mg3( SmY) Zn6结构当中,在Mg3 (SmY) Zn6相结构出现较少;力学性能测试结果表明,随着Sm含量增多,合金晶粒细化,细晶强化作用明显,合金屈服强度逐渐增大,而抗拉强度和伸长率在Sm含量为2%时达到最大,比未添加Sm元素时提高约15%以上. 相似文献
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研究了Al-Ti-B对AZ91D镁合金铸态显微组织和力学性能的影响,并探讨其化学成分与组织结构和力学性能之间的变化。研究结果表明:Al-Ti-B加入AZ91D镁合金,能明显细化组织晶粒,从而改善合金的室温力学性能。当加入Al-Ti-B时,合金晶粒细化效果较好,其室温力学性能和硬度比原来都有较大的提高。 相似文献
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稀土对ZHSi80-3合金组织和性能的影响 总被引:2,自引:0,他引:2
本文研究了稀土元素 (L a、Ce)对铸造铜合金 ZHSi80 - 3显微组织、力学性能和耐海水腐蚀性能的影响 ,并推荐了稀土含量在 ZHSi80 - 3合金中的最佳范围。实验证明 ,稀土含量在不超过 0 .1%的范围内 ,可以明显地细化 ZHSi80 - 3合金的显微组织 ,并提高强度指标 σ0 .2 及 σb,同时指出稀土元素对塑性指标 δ有不利的影响。文章还指出稀土的加入有利于提高该合金耐海水腐蚀性能。 相似文献
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Preparation and Corrosion Resistance of Rare Earth Conversion Coatings on AZ91 Magnesium Alloy 总被引:4,自引:2,他引:4
Lü Zushun 《中国稀土学报(英文版)》2005,23(5):555-558
Magnesiumalloysarewidelyusedinweaponin dustry,spacenavigationandhavegoodpotentialof applicationanddevelopmentindailycommunication facilitiesduetotheirpropertiesoflightweightandhighstrength[1].Appliedasstructuralmaterials,mag nesiumalloysmayeasilycrackduet… 相似文献