李元元
金属新材料制备与成形,包括如下子方向:高性能铸造有色合金的制备与成形、高性能粉末冶金材料的制备与成形、材料制备与成形的新装备、材料成形过程的数值模拟、难加工材料的切削加工技术等
个性化签名
- 姓名:李元元
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
材料合成与加工工艺
- 研究兴趣:金属新材料制备与成形,包括如下子方向:高性能铸造有色合金的制备与成形、高性能粉末冶金材料的制备与成形、材料制备与成形的新装备、材料成形过程的数值模拟、难加工材料的切削加工技术等
主要的研究方向为金属新材料制备与成形,包括如下子方向:高性能铸造有色合金的制备与成形、高性能粉末冶金材料的制备与成形、材料制备与成形的新装备、材料成形过程的数值模拟、难加工材料的切削加工技术等。近年来,先后主持国家杰出青年基金项目、国家自然科学基金重点和面上项目、国家“八六三”计划、国家“九五”科技攻关、国家火炬计划、国家军品配套等国家级科研项目15项,部省级科研项目24项。在以上项目的资助下,持续开展了高强耐磨铜合金、锌合金、高强韧铝合金、变形镁合金等高性能铸造有色合金制备、成形理论与技术的研究,在以下方面取得了创新成果:(1)首次提出控制高强耐磨铝青铜微观组织中的晶粒尺寸和软硬相比例而实现合金优化设计的原则,系统揭示了铝青铜显微组织与力学性能、摩擦学性能和磨损机制之间的内在规律;(2)首次发现了锌合金中的一些新相;提出了控制该类合金磨损的新机制和途径;(3)揭示了铝铜合金的变质机理、强韧化机理和热裂机理,明晰了微量合金元素对合金力学性能和热裂倾向的影响规律;(4)提出了通过合金成分优化设计与大塑性变形相结合制备高强韧镁合金的新方法。此外,还主持开展了粉末冶金新技术(尤其是温压精密成形技术)的应用基础研究,在以下方面取得了创新成果:(1)首次建立了“有孔隙连续体粉末冶金材料压制过程数值模拟模型”。(2)从宏观和微观的角度,研究了温压过程中聚合物的润滑机制和金属粉末的变形行为,比较系统地揭示了温压技术的核心――粉末致密化机制。共发表论文130篇,其中被EI收录14篇,SCI收录29篇。申请发明或实用新型专利24项。主持完成的科技成果获中国高校科技进步二等奖1项,教育部科技进步三等奖1项,广东省科技进步一等奖2项、三等奖1项,广东省“火炬”二等奖1项,广州市科技进步一等奖1项。作为主要参与者完成的科技成果获航空工业科技进步一等奖1项,机械工业部科技成果三等奖1项。其中部分成果已广泛应用于国防军工、汽车、摩托车、机械、轻工、冶金、家电、办公机械等行业,为国家和企业创造了显著的经济效益。由于其在教学、科研及产业化方面做出的突出贡献,先后获得了教育部高等学校优秀骨干教师(2002年)、广东省高校“千百十工程”国家级培养人选(2002年);广东省优秀中青年专家(1996年);第二届广东省十大杰出青年(1995年);光华科技基金三等奖(1995年);第四届中国青年科技奖(1994年);广东省第三届丁颖科技奖(1993年);政府特殊津贴(1992年)等奖励和荣誉称号。
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363
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成果数
10
李元元, Yuanyuan Li*, Junming Luo, Zongqiang Luo, Zhiyu Xiao, T. Leo Ngai
Journal of Materials Processing Technology 55(1995)154-161,-0001,():
-1年11月30日
The remarkable tribological behavior of a novel high-strength, wear-resisting zinc-based alloy, named ZMJ, which is aimed to replace bronze as an engineering material, has been studied. A desirable wear-resisting microstructure was achieved through a specially designed composition and casting procedure. The micro-constituents and microstructures were studied, their relationships with the mechanical, anti-friction and wear-resisting properties having been analyzed both qualitatively and quantitatively. It was found that the microstructure of ZMJ plays a dominant role in providing its superior wear-resisting properties. The composition of ZMJ consists of Zn, Al, Cu, Mg, Mn, Ti, B and rare earth elements. The functions of each of these alloying elements have been explained in detail. This novel alloy's strengthening mechanisms and wear mechanisms have been studied and compared with those of phosphor-tin-bronze ZCuSn10P1 (GB1176-87) and the popular ZA-27 (ASTM B669-82) zinc-based alloy. ZMJ has been proven to be an excellent engineering material by comparing its mechanical properties and friction and wear properties with those of ZCuSnlOP1 and ZA-27. Industrial applications in gears, worm-gears, bearing and bushes etc. have shown that ZMJ brings significant benefits in energy saving and enhances the quality and life expectancy of these machinary parts.
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李元元, Yuanyuan Li, Tungwai Leo Ngai, Wei Xia
Wear 197(1996)130-136,-0001,():
-1年11月30日
By studying microstructural effects on the mechanical and tribological behaviors of aluminum bronzes, a novel high-strength wear-resisting aluminum bronze (KK) has been developed by optimizing microstructures, modifying, adding special elements and controlling the casting process. The mechanical properties, friction and wear behavior of this alloy have been tested and compared with two other commercial aluminum bronzes of the same class. Experimental results show that the properties of the novel KK bronze are much superior to those of the other bronzes.
Aluminum bronze, Wear resisting, Friction and wear, Modify
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【期刊论文】Effects of Mn content on the tribological behaviors of Zn-27% A1-2% Cu alloy
李元元, Yuanyuan Li, Tungwai Leo Ngai, Wei Xia, Wen Zhang
Wear 198(1996)129-135,-0001,():
-1年11月30日
Friction and wear characteristics of a Zn-27% Al-2% Cu alloy, modified with Ti and misch metal, with different Mn contents, coupled with steel have been studied. A pin-on-disk tribometer was used to measure the friction coefficient of alloy samples under different loads, speeds and lubricating conditions while the wear volume and temperature rise of the lubricant were measured by a cylinder-on-ring wear tester. Friction and wear characteristics of these Mn-containing alloys were compared with those of ZA-27. Effects of Mn content on the tribological behaviors and microstructures were studied and the relationships between the tribological characteristics and the microstructures of the alloy were also analyzed. Experimental results indicate that the addition of Mn can significantly improve the tribological behaviors of the Zn-27% Al-2% Cu alloy. Finally, an optimum Mn content for the best overall mechanical properties and tribological behaviors was obtained.
Tribological behaviors, Manganese, Zn-Al-Cu alloy
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李元元, YUANYUAN LI, T. L. NGAI*
JOURNAL OF MATERIALS SCIENCE 31(1996)5333-5338,-0001,():
-1年11月30日
Microstructural effects on mechanical and tribological behaviours have been studied for a series of aluminium bronzes with different microstructures. ASTM 1045 and 52100 steels were used as the counterparts in the friction and wear tests. Experimental data show that the coefficients of friction, wear rate and mechanical properties strongly depend on the volume fraction of a-phase present in the alloy and, to a lesser extent, on the average a-grain size. The minimum coefficients of friction and the wear rate correspond to a yield strength of 370 Nmm-2 and a bulk hardness of liB 168. Except for extreme low average a-grain size (corresponding to low volume fraction), both the coefficients of friction and the wear rate show linear relations with the reciprocal of the yield strength of the alloy, but not to the reciprocal of the hardness as expected. Based on these results, a design principle for high strength wear-resistant aluminium bronze has been developed.
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李元元, LI Yuan-yuan, FEI Jin, CHEN Wei-ping, ZHANG Wei-wen, SHAO Ming
J. CENT. SOUH UNIV. TECHNOL. 2002, 9 (4): 228~234,-0001,():
-1年11月30日
The 2024/3003 alumintan gradient alloys are prepared by semi-continuous casting. The influences of throttle bore diameter of embedded nozzle and temperature of internal melt on composition distribution, macrestructure, hardness are analyzed, and the stability of gradient distribution of composition, macmstructure and hardness along the axial direction of the ingot is also studied. The results show that diffe-rent composition profiles can be achieved by adjusting the processing parameters; the volume fraction of inner ahoy in the ingot can be increased by enlarging the threttle bore diameter and elevating the temperature of inner melt; quasi-steady solidification can be realized within 20s during cast processing, and consistent quality ingot is obtained by controlling the casting speed and liquid height of inner melt.
2024/, 3003 Al alloys, gradient materials, semi-continunus casting
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李元元, LI Yuan-yuan, XIAO Zhi-yu, NGAI Tungwai Leo, XIA Wei, CHEN Wei-ping
Vol. 12 No.4 Trans. Nonferrous Met. Soc. China Aug. 2002,-0001,():
-1年11月30日
Effects of different sintering temperature and sintering time on the relative density of the sintered compacts were studied to obtain the optimal sintering parameters for the fabrication of NbC patti culate reinforced iron-base compos ire. With optimal sintering temperature of 1280℃ and sintering time of 80min, wear-resisting, high density NbC particulate reinforced iron-base composites can be obtained using warm compaction powder metallurgy. The microstructure, relative density, mechanical properties and tribologieal behaviors of the sintered composites were studied. The results indicate that the mechanical properties of the sintered compacts were closely related to the sintered density. The iron base composite materials with different combinations of mechanical properties and tribological behaviors were developed for different applications. One of the developed composite, which contains 10% NbC, possesses a high strength of 815MPa with a remarkable friction and wear behaviors. The other developed composite, which contains 15% NbC, possesses a lesser strength of 515 MPa but with exeeUent friction and wear behaviors.
iron-base composite, NbC particulate, mechanical property, tribological behaviors
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李元元, LI Yuan-yuan, XIAO Zhi-yu, NGAI Tungwai Leo, ZHOU Zhao-yao, SHAO Ming
Vol. 12 No.4 Trans. Nonferrous Met. Soc. China Aug. 2002,-0001,():
-1年11月30日
he fine NbC particles are embedded on the surface of iron particles and evenly distributed in the mixed powders. Warm compaction was used not only to increase the green density but also to improve the formability of the mixed powder and to improve the compact's green strength to facilitate handling. The influences of fabrication parameters such as ball milling time, annealing temperature and time, warm compaction temperature, sintering temperature and sintering time were studied. Compacts with a relative sintered density of 97% and a tensile strength of more than 800MPa can he obtained by using a ball milling time of 5h, an annealing temperature of 800℃, a compaction pressure of 600MPa, warm compaction temperatore of 120℃, sintering temperature of 1 280℃, and sintering time of 80min. The shrinkage at this sintering condition was approximately 4.3%.
iron-base composite, NbC particulate, warm compaction powder metallurgy
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【期刊论文】Effect of die wall lubrication on warm compaction powder metallurgy
李元元, Y.Y. Li*, T.L. Ngai, D.T. Zhang, Y, Long, W. Xia
Journal of Materials Processing Technology 129(2002)354-358,-0001,():
-1年11月30日
Die wall lubrication was applied on warm compaction powder metallurgy in the hope to reduce the concentration level of the admixed lubricant, since lubricant is harmful to the mechanical properties of the sintered material. Iron-based samples were prepared by die wall lubricated warm compaction at 135 and 175℃, using polytetrafluoroethylene (PTFE) emulsion as the die wall lubricant. Compacting pressures of 700 and 550MPa were used. An admixed lubricant concentration ranging from 0 to 0.6wt.% was used in this study. The results show that in addition to a decrease in ejection forces, the green density of the compacts increased linearly with the decrease in the admixed lubricant content. The mechanical properties of the sintered compacts increase sharply when the admixed lubricant concentration was reduced to 0.125wt.% or less, No scoring was observed in all of the experiments.
Warm compaction, Die wall lubrication, Powder metallurgy
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【期刊论文】Effect of sintering parameters on warm compacted iron-based material①
李元元, LI Yuan-yuan, XIAO Zhi-yu, NGAI Tungwai Leo, XIA Wei, CHEN Wei-ping
Vol. 13 No.6 Trans. Nonferrous Met. Soc. China Dec. 2003,-0001,():
-1年11月30日
Iron-based powder metallurgy material was prepared by warm compaction at 125℃ using a compacting pressure of 700MPa. Sintering temperature ranging from 1100℃ to 1300℃ and sintering time ranging from 40min to 80min were used to study the effects of sintering parameters on the compacts. Die wall lubrication polytetrafluoroethylene (PTFE) emulsion was also applied in combination with warm compaction in hope to increase the compact density and the mechanical properties of the sintered material. Green and sintered density, spring back effect and sinter shrinkage were measured. Mechanical properties of both as-sinter and heat treated samples were also measured. Results show that mechanical properties of the sintered compacts increase with the increase of sintering temperature and sintering time. Sample prepared by die wall lubricated warm compaction always shows higher density and mechanical properties.
warm compaction, powder metallurgy, iron-based material, sintering, die wall lubrication
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李元元, LI Yuan-yuan, LIU Ying, NGAI Tungwai Leo, ZHANG Da-tong, GUO Guo-wen, CHEN Wei-ping
Vol. 14 No.1 Trans. Nonferrous Met. Soc. China Feb. 2004,-0001,():
-1年11月30日
AZ31 Mg alloy was prepared through equal channel angular pressing (ECAP) by Bc route in two different dies, in which the intersecting angles between channels are 90
AZ31 magnesium alloy, ECAP, die angle
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