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Al_2O_3弥散粒子对Cu-Al_2O_3合金高温退火显微组织的影响 被引量:9
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作者 程建奕 敖学文 +1 位作者 汪明朴 郭明星 《中国有色金属学报》 EI CAS CSCD 北大核心 2009年第11期1928-1933,共6页
利用TEM研究弥散Al2O3粒子对变形Cu-Al2O3弥散强化铜合金高温退火显微组织的影响。结果表明:弥散强化铜合金等时(1h)退火时,显微硬度HV呈缓慢下降趋势,没有发生突降现象;弥散铜高温退火主要以位错亚结构回复为主,而亚晶较为少见;粒子弥... 利用TEM研究弥散Al2O3粒子对变形Cu-Al2O3弥散强化铜合金高温退火显微组织的影响。结果表明:弥散强化铜合金等时(1h)退火时,显微硬度HV呈缓慢下降趋势,没有发生突降现象;弥散铜高温退火主要以位错亚结构回复为主,而亚晶较为少见;粒子弥散参数和胞壁性质对退火时的回复产生非常重要的影响;Al2O3弥散粒子影响位错在胞壁内的运动,阻碍胞壁内位错重排、迁移,使得胞壁很难通过运动而获得位向差的积累,从而阻碍大角晶界的形成;随合金中弥散粒子含量的增大和粒子间距的减小,亚晶形核更加困难;Cu-Al2O3合金冷轧过程中形成的胞组织的胞壁具有较小的平均位向差,导致弥散铜合金高温退火时难以形成具有明晰边界的亚晶组织。 展开更多
关键词 Al2O3弥散粒子 弥散强化铜 显微组织 退火 回复
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用于活性金属熔解的Y2O3粒子弥散钨合金的开发
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作者 裕.,石渡 伊藤义康 《钨钼材料》 1996年第1期56-58,共3页
关键词 钨合金 高熔点金属 三氧化二钆 粒子弥散
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磁流变液沉降稳定性研究现状与趋势 被引量:10
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作者 唐欣 凌虹 胡克鳌 《磁性材料及器件》 CAS CSCD 2004年第3期5-8,共4页
磁流变液的稳定性至关重要。对影响弥散粒子沉降稳定性的因素进行了讨论,指出并评述了表征磁流变液沉降稳定性的方法,综合介绍了提高磁流变液弥散粒子沉降稳定性的措施,包括表面活性剂和稳定剂的引入、纳米级物质的加入,用复合磁性响应... 磁流变液的稳定性至关重要。对影响弥散粒子沉降稳定性的因素进行了讨论,指出并评述了表征磁流变液沉降稳定性的方法,综合介绍了提高磁流变液弥散粒子沉降稳定性的措施,包括表面活性剂和稳定剂的引入、纳米级物质的加入,用复合磁性响应粒子、轻质磁性材料作弥散粒子。最后展望了磁流变液的应用前景。 展开更多
关键词 磁流变液 表征 沉降稳定性 弥散粒子
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4种均匀化态Al-Zn-Mg-Cu合金的淬透性 被引量:4
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作者 李承波 张新明 +2 位作者 刘胜胆 韩素琦 邓运来 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2017年第7期1712-1718,共7页
通过末端淬火方法研究7075,7050,7055和7085这4种均匀化态合金的淬透性,采用扫描电镜和透射电子显微镜对微观组织进行分析。研究结果表明:这4种均匀化态合金距离喷水端98 mm处的维氏硬度比3 mm处的维氏硬度分别下降33%,6%,7%和5%,7075... 通过末端淬火方法研究7075,7050,7055和7085这4种均匀化态合金的淬透性,采用扫描电镜和透射电子显微镜对微观组织进行分析。研究结果表明:这4种均匀化态合金距离喷水端98 mm处的维氏硬度比3 mm处的维氏硬度分别下降33%,6%,7%和5%,7075合金淬透层深度为23 mm,其余3种合金淬透层深度均在100 mm以上;7075合金慢速淬火时,更多大尺寸的η平衡相和T相倾向于在非共格的E相上析出;时效后平衡相的周围出现明显无沉淀析出带,导致维氏硬度明显下降,淬透性大大降低,而其余3个合金中弥散粒子(Al3Zr)与基体共格,析出的平衡相粒度较小且数量较少,因而淬透性均较好。 展开更多
关键词 AL-ZN-MG-CU合金 淬透性 弥散粒子 淬火
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Effect of homogenization time on quench sensitivity of 7085 aluminum alloy 被引量:11
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作者 郑玉林 李承波 +2 位作者 刘胜胆 邓运来 张新明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2275-2281,共7页
The effect of homogenization time on quench sensitivity of a cast 7085 aluminum alloy was investigated by means of end-quenching test, optical microscope (OM), scanning electron microscope (SEM) and transmission e... The effect of homogenization time on quench sensitivity of a cast 7085 aluminum alloy was investigated by means of end-quenching test, optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that with the increase of homogenization time from 48 h to 384 h, quench sensitivity increased slightly as the largest difference in the hardness was increased from 5.2% to 6.9% in the end-quenched and aged specimens. Prolonging homogenization had little effect on the grain structure, but improved the dissolution of soluble T phase and resulted in larger Al3Zr dispersoids with a low number density. Some small quench-induced η phase particles on Al3Zr dispersoids were observed inside grains during slow quenching, which decreased hardness after subsequent aging. The change in the character of Al3Zr dispersoids exerted slight influence on quench sensitivity. 展开更多
关键词 7085 aluminum alloy HOMOGENIZATION end quenching quench sensitivity Al3Zr dispersoids equilibrium η phase
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Dynamic recrystallization behavior of 7085 aluminum alloy during hot deformation 被引量:11
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作者 李东锋 张端正 +4 位作者 刘胜胆 单朝军 张新明 王琴 韩素琦 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第6期1491-1497,共7页
The dynamic recrystallization behavior of 7085 aluminum alloy during hot compression at various temperatures (573?723 K) and strain rates (0.01-10 s^-1) was studied by electron back scattered diffraction (EBSD... The dynamic recrystallization behavior of 7085 aluminum alloy during hot compression at various temperatures (573?723 K) and strain rates (0.01-10 s^-1) was studied by electron back scattered diffraction (EBSD), electro-probe microanalyzer (EPMA) and transmission electron microscopy (TEM). It is shown that dynamic recovery is the dominant softening mechanism at high Zener?Hollomon (Z) values, and dynamic recrystallization tends to appear at low Z values. Hot compression with ln Z=24.01 (723 K, 0.01 s?1) gives rise to the highest fraction of recrystallization of 10.2%. EBSD results show that the recrystallized grains are present near the original grain boundaries and exhibit similar orientation to the deformed grain. Strain-induced boundary migration is likely the mechanism for dynamic recrystallization. The low density of Al3Zr dispersoids near grain boundaries can make contribution to strain-induced boundary migration. 展开更多
关键词 aluminum alloy Zener-Hollomon parameter dynamic recrystallization strain-induced boundary migration Al3Zr dispersoids
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Grain structure effect on quench sensitivity of Al-Zn-Mg-Cu-Cr alloy 被引量:1
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作者 李承波 韩素琦 +2 位作者 刘胜胆 邓运来 张新明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2276-2282,共7页
The effect of grain structure on quench sensitivity of an Al-Zn-Mg-Cu-Cr alloy was investigated by hardness testing, optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscop... The effect of grain structure on quench sensitivity of an Al-Zn-Mg-Cu-Cr alloy was investigated by hardness testing, optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and scanning transmission electron microscopy. The results show that with the decrease of quenching rate from 960 ℃/s to 2 ℃/s, the hardness after aging is decreased by about 33% for the homogenized and solution heat treated alloy(H-alloy) with large equiaxed grains and about 43% for the extruded and solution heat treated alloy(E-alloy) with elongated grains and subgrains. Cr-containing dispersoids make contribution to about 33% decrement in hardness of the H-alloy due to slow quenching; while in the E-alloy, the amount of(sub) grain boundaries is increased by about one order of magnitude, which leads to a further 10% decrement in hardness due to slow quenching and therefore higher quench sensitivity. 展开更多
关键词 grain structure Al-Zn-Mg-Cu-Cr alloy DISPERSOIDS quench sensitivity
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Fabrication,microstructures and mechanical properties of ZrO_2 dispersion-strengthened Q345 steel 被引量:3
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作者 Bao-an WANG Ning WANG +4 位作者 Yu-jing YANG Hua ZHONG Ming-zhen MA Xin-yu ZHANG Ri-ping LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第6期1132-1140,共9页
ZrO2 dispersion-strengthened Q345 steel with different ZrO2 contents(0%, 0.5% and 1.2%, mass fraction) was fabricated through combining middle frequency induction furnace melting and cored-wire injection technologie... ZrO2 dispersion-strengthened Q345 steel with different ZrO2 contents(0%, 0.5% and 1.2%, mass fraction) was fabricated through combining middle frequency induction furnace melting and cored-wire injection technologies. The microstructure and fracture surface morphology of ZrO2 dispersion-strengthened Q345 steel in casting, normalizing and quenching states were observed using optical microscopy, scanning electron microscopy and transmission electron microscopy. Also, strengthening and fracture mechanisms of the alloys were analyzed. Results showed that the dispersed ZrO2 particles added into Q345 matrix significantly enhanced its strength, and the main strengthening mechanism was the formation of dislocation cells and pinning effect caused by the addition of ZrO2 particles. Apart from that, the hard martensite phase, grain refinement and high ZrO2 particles content also played important roles in strengthening effect. Furthermore, the nanoindentation was also performed to further reveal the strengthening effect and mechanism of dispersed ZrO2 particles in Q345 steel. Results showed that the hardness of ZrO2 dispersion-strengthened Q345 steel increased with the increase of ZrO2 content. 展开更多
关键词 Q345 steel ZrO2 particles dispersion strengthening microstructure mechanical properties
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均匀化前预处理对Al-4.3Zn-1.7Mg合金板材组织和性能的影响
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作者 欧庆峰 聂颖 《轻合金加工技术》 CAS 北大核心 2016年第8期24-29,共6页
采用光学显微镜、扫描电镜、透射电镜和常温拉伸等测试方法,研究均匀化工艺对Al-4.3Zn-1.7Mg合金板材显微组织和力学性能的影响。结果表明,经双级均匀化处理的Al-4.3Zn-1.7Mg合金铸锭,其热轧板经固溶时效处理后的强度及伸长率均高于经... 采用光学显微镜、扫描电镜、透射电镜和常温拉伸等测试方法,研究均匀化工艺对Al-4.3Zn-1.7Mg合金板材显微组织和力学性能的影响。结果表明,经双级均匀化处理的Al-4.3Zn-1.7Mg合金铸锭,其热轧板经固溶时效处理后的强度及伸长率均高于经常规均匀化处理的合金热轧板的强度和伸长率。铸锭预处理温度从250℃升高至400℃,合金板材的强度及伸长率呈下降趋势,预处理时间从4 h延长至24 h,合金板材的强度呈现出先下降后上升的趋势,而伸长率无明显变化。 展开更多
关键词 双级均匀化 弥散粒子 预处理 力学性能
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