共查询到19条相似文献,搜索用时 281 毫秒
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采用液-液掺杂并结合粉末冶金的方法制备了不同稀土氧化镧含量(0.5%~1.5%)的掺杂钼坯,轧制成钼板材后,研究了钼板高温拉伸性能,并利用SEM、EDS和显微镜对钼合金的组织和断口形貌进行了分析。结果表明:氧化镧不仅细化了钼合金晶粒,还提高了钼板的再结晶温度,在1200℃,纯钼板晶粒基本长成等轴晶,而氧化镧钼板的晶粒细小且长径比大。随着氧化镧掺杂量的提高,氧化镧钼板强度逐渐增大,而伸长率在掺杂量为1.0%时最佳。纯钼板在1000℃之后转成脆性断裂,而氧化镧钼板在试验温度范围内始终是塑性断裂。 相似文献
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氧化镧弥散强化钼合金裂纹扩展的TEM原位观察 总被引:2,自引:0,他引:2
采用透射电子显微镜动态拉伸技术对氧化镧弥散强化钼合金的裂纹扩展过程进行原位观察.发现裂纹的扩展模式受基体晶粒尺寸与氧化镧颗粒的形状和尺寸影响.裂纹尖端遇到非常细小的晶粒时会发生沿晶界扩展;裂纹尖端遇到棒状微米级粗大氧化镧颗粒时,裂纹穿过氧化镧颗粒扩展;遇到椭球状亚微米级氧化镧颗粒时,裂纹越过氧化镧颗粒扩展,并发生裂纹扩展方向的偏转;而当裂纹扩展到细小的球状纳米级氧化镧颗粒时会被阻止,裂纹以"Z"字型或跨接的方式继续扩展.根据实验结果从裂纹扩展方式和能量耗散角度对氧化镧弥散钼合金的细晶增韧和颗粒增韧机制进行分析和讨论. 相似文献
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通过水热合成、共沉淀、共分解、粉末冶金和旋锻方法制备了3种掺杂2.0%(体积分数)不同氧化物(Al2O3、ZrO2和La2O3)的钼合金棒材。3种纳米氧化物均使钼晶粒细化70%以上,且使合金的断裂模式从脆性断裂转变为韧性断裂,从而显著提高钼合金的综合力学性能,克服强度和韧性之间的矛盾。在3种钼合金中,Mo-ZrO2合金具有最佳的强度和塑性,这归因于细小的ZrO2颗粒以及ZrO2与钼基体之间的半共格界面。此外,建立了与位错密度、氧化物体积分数和尺寸以及钼晶粒尺寸相关的定量强化模型。 相似文献
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《中国有色金属》2007,(1):82-82
本发明提供一种细晶稀土氧化物掺杂钼合金及其制备方法,以二氧化钼为原料,采用雾化法掺杂稀土氧化物,掺杂后的钼合金粉经过球磨、过筛处理后,在800℃-100℃的多段马弗炉中使用氢气进行还原处理,再将还原后的粉体在150MPa~200MPa下冷等静压压制成型,成型后的坯料在中频感应烧结炉中分段烧结,时间为16小时-24小时。烧结后的材料经过75%-97%的变形加工采用常规机加工方法制备钼合金棒材或板材等材料。本发明的钼合金,具有细小的晶粒组织,平均晶粒宽度为0.5μm~1.2μm,平均尺寸小于300n。的细小稀土氧化物均匀弥散分布在钼合金基体上,与普通粗晶钼合金相比,具有更高的强度、延展性和韧性,具有更广泛的用途。 相似文献
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采用金相显微镜、扫描电子显微镜、透射电子显微镜和压缩试验机等手段研究了纳米氧化镧的添加对热压烧结制备的多相Mo-12Si-8.5B合金微观组织及力学性能的影响。结果表明,合金的微观组织是La_2O_3和Mo_5SiB_2以颗粒形态弥散分布在具有连续结构α-Mo基体的晶粒内和晶界处。纳米尺度的氧化镧颗粒主要分布在Mo-12Si-8.5B合金中α-Mo的晶粒内,部分存在于和颗粒内。纳米氧化镧颗粒存在同时细化了α-Mo基体的晶粒尺寸和与相的颗粒尺寸,使合金内α-Mo、Mo_3Si和Mo_5SiB_2相的平均晶粒或颗粒尺寸均小于1μm。通过定量分析发现,纳米氧化镧增强Mo-12Si-8.5B合金中细晶强化和颗粒强化是主要的强化机制。 相似文献
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利用OM,SEM,TEM,EBSD,XRD和电子材料试验机研究了Zn含量(1%-4%,质量分数)对反挤压Mg-8Sn-Zn合金组织、织构演化和力学性能的影响.结果表明,所有合金均可在相对较低的挤压温度(250℃)和较高的挤压速度(2 m/min)下成形.在反挤压过程中,所有在均质化处理后残留的粗大第二相在挤压过程中破碎并沿着挤压方向被拉伸成条带状;所有的粗大晶粒均转变为细小的等轴晶,其平均晶粒尺寸分别为7.4,8.3和10.5μm.随着Zn含量的增加,在挤压态合金晶内和晶间分布的细小弥散第二相的体积分数增加,这些第二相主要由亚微米级的Mg2Sn相和纳米级的富Zn相组成.弥散分布在晶界上的第二相有效地钉扎了晶界,从而细化了晶粒尺寸.另外随着Zn含量的增加,合金的织构强度降低,这和变形晶粒的体积分数减小有关.组织细化、织构弱化和第二相弥散化是Mg-Sn-Zn合金强度提高和拉伸/压缩屈服点各向异性减弱的主要因素. 相似文献
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利用往复挤压(RE-n,n为挤压道次)制备Mg-4Al-2Si(AS42)、Mg-4Al-4Si(AS44)和Mg-6Al-6Si(AS66)合金,并在150℃和1.33×10-3s-1的初始应变速率下测试合金的拉伸性能。结果表明:RE-8-AS42合金晶粒尺寸为2.1μm,Mg2Si颗粒尺寸为1.3μm;RE-4-AS42合金晶粒尺寸为4.8μm,组织中含有2~20μm的大块Mg2Si颗粒;RE-AS44和RE-AS66合金晶粒尺寸约为11μm,组织中存在>20μm的Mg2Si颗粒。合金拉伸强度随挤压道次增加而提高,RE-8-AS42合金性能最佳,抗拉强度、屈服强度和伸长率分别为250 MPa、197 MPa和62%,高的性能归因于细小的晶粒和阻碍晶界滑移的细小稳定Mg2Si颗粒。 相似文献
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1 Introduction The microstructure and properties of aluminium alloys are strongly affected by adding small quantities of scandium. Minor Sc may improve the temperature of recrystallization and fracture toughness, decrease the sensitivity of stress corrosi… 相似文献
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针对不同C含量的690合金,分别研究了C含量对合金晶粒长大行为及退火孪晶的影响。结果表明:在0.011%~0.028%的范围内,C含量变化显著影响690合金晶粒长大过程,其平均晶粒尺寸随着C含量升高而逐渐减小,尤其是C含量在0.020%~0.028%区间时,C含量的晶粒细化效果更为显著。合金组织中∑3n(n=1、2、3)晶界体积分数基本均随C含量升高而呈先升后降趋势;0.020%左右C含量合金具有更高的∑9和∑27晶界体积分数分布。在此基础上选择C含量为0.02%的合金进一步探讨了固溶温度变化引起的合金晶粒尺寸与力学性能之间的定量关系发现:690合金晶粒细化对强度的影响规律遵循位错塞积模型的Hall-Petch关系,且通过拟合发现抗拉强度强化系数kT值(18.95 MPa·mm1/2)小于屈服强度强化系数ky值(23.67 MPa·mm1/2),晶粒细化对屈服强度的强化效果比抗拉强度更高。溶质元素变化通过固溶强化引起的强化增量为243 MPa,而晶粒细化引起的强化增量在157~7 MPa之间,690合金强化机制主要为固溶强化机制。 相似文献
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Min Song Yuehui He Shanfeng Fang 《Journal of Materials Engineering and Performance》2011,20(3):377-381
The effects of Zr content on the yield strength of an Al-Sc alloy are investigated experimentally. It has been shown that
the yield strength increases with time at the beginning of annealing for the investigated one Al-Sc alloy and three Al-Sc-Zr
alloys. Such an increase of yield strength results from the high nucleation rate for Al3Sc particles in Al-Sc alloy and Al3(Sc1−x
,Zr
x
) particles in Al-Sc-Zr alloys. Throughout the annealing, the yield strength increases with the Zr content, indicating that
the alloy with higher Zr content possesses higher yield strength. The high yield strength of the alloy with high Zr content
is due to the higher number density and volume fraction of the particles as well as their smaller size and inter-particle
spacing. Such a microstructural feature for the particles exhibits a larger Orowan strengthening effect by inhibiting the
dislocation movements. 相似文献
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《Acta Materialia》2002,50(11):2825-2836
An iron aluminide alloy of base composition Fe-40Al has been prepared by mechanical alloying and processed using a variety of powder consolidation methods and heat treatments to produce a range of grain sizes and oxide dispersoid sizes. The strengths of these materials have been determined at room temperature and related to the various aspects of microstructure. Fine dispersoid particles may pin grain boundaries and help determine the fine grain size and contribute very significantly to the material strength. Grain size strengthening is shown to be a rather small component of the material strength, with the matrix strength being rather high for this intermetallic. The influence of other factors such as texture and the direction of application of stress (tension or compression) are also briefly discussed. 相似文献
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采用电弧熔铸和机械合金化+热压烧结技术制备晶粒尺寸相差较大的Cr-25Nb合金,研究其在950及1200 ℃空气中的氧化行为。结果表明,熔铸态及机械合金化Cr-25Nb合金氧化后均没有发生Cr的单一外氧化,而形成了以Cr2O3为外层、NbCrO4为内层的双层氧化膜结构;机械合金化Cr-25Nb合金在950及1200 ℃的氧化速度均小于熔铸态合金,特别是在1200 ℃氧化100 h后,熔铸态Cr-25Nb合金的氧化增重是机械合金化合金的2倍多。这主要是因为晶粒细化促进了氧化膜内应力的释放,提高了氧化膜与基体的粘附性 相似文献
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Haichang Jiang Ying Chen Dan Yang Hongding Sun Jianmin Zeng Lijian Rong 《金属学报(英文版)》2014,27(2):217-222
The influence of Mo addition on the microstructure and properties of TiNiNb alloy with 4.5 at.% Nb has been investigated systemically.The experimental results indicated that the uniform distribution of Mo depresses the appearance of coarse b-Nb particles at the grain boundaries and short stripped texture consisting of abundant fine disperse Nb-rich particles appears around the grain boundaries.The yield strength of the alloy was enhanced from 450 to 600 MPa due to the solution strengthening of Nb and Mo and the elongation reached 18% when the Mo content is 0.5 at.%.At the same time,the shape memory effect of the alloy also is improved significantly by the Mo addition.The maximum recoverable strain of the alloy with 0.5 at.% Mo is near 8% and has reached the high level of Ni–Ti binary alloys.This novel highstrength alloy is promising to be used for high pressure tube and the macro-scale coupling with higher-quality requirements. 相似文献
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Effects of minor Sc on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr based alloys 总被引:2,自引:0,他引:2
Five kinds of Al-Zn-Mg-Cu-Zr based alloys with different Sc additions were prepared by ingot metallurgy. The effects of minor Sc on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Zr based alloys were investigated using tensile tests, optical microscopy (OM), and transmission electron microscopy (TEM). The results show that the ultimate tensile strength and yield strength are improved by 94 and 110 Mpa, respectively, and the elongation to failure remains at a reasonable extent (11.1%) in the Al-Zn-Mg-Cu-Zr based alloy with 0.21 wt.% Sc addition after solution heat treatment at 475℃ for 40 min and then aged at 120℃ for 24 h. The addition of minor Sc induces the formation of Al3(Sc,Zr) particles, which are highly effective in refining the cast microstructures, retarding recrystallization, and pinning dislocations. The increment of strength is attributed mainly to fine grain strengthening, precipitation strengthening of Al3(Sc,Zr) particles, and substructure strengthening. 相似文献