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Effect of Cooling Rate on the Microstructure and Mechanical Properties of ZK60 alloy

Second International Conference on Magnesium(ICM 2006)

作者： Qunfeng Chang, Yinghong Peng, Dayong Li and Xiaoqin Zeng School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai, 200030, China Light alloy Net Forming National Engineering Research Center, Shanghai, 200030, China

A process of warm deep drawing of magnesium alloy with variable blank holder force has been presented in this study. A hydraulic press that can realize adjustable blank holder forces was developed and its working principle and control system introduced. A warm deep drawing mould was fixed and warm deep drawing experiments are conducted on the hydraulic press. Different variation schemes of the blank holder force with the stroke of the punch was tested, and compared with experiment results. The experimental results show that adopting the variable blank holder force technique can remarkably improve the forming performance and decrease the reduction ratio of thickness from 15.21% to 12.35%. It is further demonstrated that the suitable blank holder force variation scheme is an inverted V curve with the punch stroke.

关键词： variable blank holder force magnesium alloy sheet warm deep drawing hydraulic press

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Effect of Cooling Rate on the Microstructure and Mechanical ...

Electrode Characteristics of MmNi_5-based alloys for Nickel-Metal Hydride Batteries

Second International Conference on Magnesium(ICM 2006)

作者： Jinbao Lin, Qudong Wang, Liming Peng, Yang Zhou, Wenjiang Ding National Engineering Research Center for Light alloy Net Forming, Shanghai Jiao Tong University, Shanghai, China, 200030 Taiyuan University of Science and Technology, Taiyuan, China, 030024

Microstructure and mechanical properties of Mg-6.0wt%Zn-0.5wt%Zr (ZK60) alloy were studied as a function of cooling rate. The temperature field and cooling rate during the casting process were investigated by use of finite element analysis (FEA) simulation. The results showed that the microstructure was refined and the eutectic phase distributed much uniformly with the increase of cooling rate. The increase of yield strength, ultimate strength and elongation can be ascribed to the strengthening effect of fine grain. Relationship between grain size and yield strength is consistent with the Hall-Petch formalism: σy =80.37 +132.56d-1/2.

关键词： ZK60, magnesium alloy, cooling rate, temperature field.

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Journal of Materials Science & Technology 1994年第4期10卷 310-312页

作者： Mingming GENG (Dept. of Precision alloy, Central Iron & Steel Research Institute, Beijing, 100081. China) Central Iron and Steel Research Inst Beijing China

Negative electrodes of the Ni-metal hydride battery were made from hydrogen storage alloy Mm0.9Ti0. 1Ni3. 9Mn0.4Co0.4Al0.3 mod fied by coating with Ni or mixing with Co powder. The cell volume expansion of hexagonal structure was about 12 % after coating with 11 % Ni on the alloy Surface,When this alloy was mixed with Co powder. the discharge capacity and the utilization efficiency of the hydrogen storage alloy increased. When the alloy was coated with 11 wt-% Ni and also mixed with 10 wt-% Co powder. the capacity decay for a small sealed cylindrical cell (AA size. 1 Ah) was only about 4 % after 200 cycles

关键词： Ni Met Electrode Characteristics of MmNi5-based alloys for Nickel-Metal Hydride Batteries PVA

V掺杂对CoCrFeNiV_(x)高熵合金相结构的影响

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四川师范大学学报（自然科学版） 2024年第5期47卷 656-661页

作者：王俊余韵严成龙张远春李强王江张仁辉攀枝花钢城集团有限公司四川攀枝花617000 攀枝花学院钒钛学院四川攀枝花617000 华东交通大学材料科学与工程学院江西南昌330013

采用相图计算方法(CALPHAD),应用热力学计算模型对高熵合金CoCrFeNiV_(x)(x=0.0~1.0)的相图进行模拟,并用分子动力学方法对V掺杂的高熵合金CoCrFeNiV_(0.2)的强度和温度的关系以及变形机制进行研究.结果发现,未掺V时,室温下体系有4种相... 详细信息

采用相图计算方法(CALPHAD),应用热力学计算模型对高熵合金CoCrFeNiV_(x)(x=0.0~1.0)的相图进行模拟,并用分子动力学方法对V掺杂的高熵合金CoCrFeNiV_(0.2)的强度和温度的关系以及变形机制进行研究.结果发现,未掺V时,室温下体系有4种相,分别为BCC-A2、BCC-A2#2、FCC-A1和SIGMA相,SIGMA相含量最高,随着温度升高到550 K,BCC-A2和BCC-A2#2相消失,FCC-A1成分下降,SIGMA相成分达到极大值.当V含量为0.2时,室温下体系有3种相,分别为BCC-A2、FCC-A1和BCC-A2#2相,随着温度升高到600 K,BCC-A2和BCC-A2#2相含量减少,FCC-A1相增加,同时SIGMA相出现.在600~620 K区间发生BCC-A+BCC-A2#2→SIGMA转变,并在990 K时,SIGMA相完全消失.当V含量为0.4~1.0时,600~800 K区间SIGMA相含量均高于V含量为0.2时的相图.因此,V元素的掺入有助于抑制高熵合金CoCrFeNiV_(x)脆性SIGMA相出现.此外,通过分子动力学模拟发现,高熵合金CoCrFeNiV_(0.2)的变形机制主要为晶粒旋转、晶内层错以及非晶化.

关键词：相图计算方法高熵合金 CoCrFeNiV 相图

Abnormal Psychology : Current Perspectives 8th ed.

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γ-PHASE IN WC-Co CEMENTED CARBIDES

1999年

作者： alloy Lauren B.

来源：畅想之星图书光盘版（南... 评论

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中国有色金属学会会刊：英文版 1993年第2期3卷 51-57页

作者： Liu,Shourong Tianjin Institute of Hard alloy,Tianjin 300222,China

The allotropic transformation process of the γ-phase in WC-Co cemented carbides has been *** of γ-grain and the γ-domain have been proposed forward:The γ-domain is the residual FCC-typeβ-Co grain that failed to transform when cooling alloy sample and γ-base is the HCP-type x-Co transformedmainly by means of diffusion,the outline of the γ-grain is consistent with the newly fromed β-Co grain formedat high *** quantity and distribution of γ-grain domain are related to the cooling rate after sinter-ing and influence the alloys properties.

关键词： WC-Co cemented carbides γ-grain γ-domain

Development of Rapidly Quenched Soft Magnetic Materials in China

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Journal of Materials Science & Technology 2000年第2期16卷 131-136页

作者： Shaoxiong ZHOU (National Amorphous and Nanocrystalline alloy Engineering Research Center, Central Iron and Steel Research Institute, Beijing 100081, China) National Amorphous and Nanocrystalline alloy Engineering Research Center Central Iron and Steel Research Institute Beijing 100081 China

The discovery of the first Fe-based ferromagnetic amorphous alloy in 1966 had made an impact on conventional magnetic materials because of its unique properties. Since then, a number of amorphous magnetic materials have been successfully developed and used in a wide variety of applications. A brief review of R & D activities on amorphous soft magnetic materials in China is given from the beginning to the present in a somewhat chronological order, followed by a brief introduction to their applications on electric and electronic industries. An analysis and a prospect of Chinese market of such amorphous materials are also presented.

关键词： Development of Rapidly Quenched Soft Magnetic Materials in China

β→α Transformation of γ-Phase in Sintered WC-Co Cemented Carbides

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Journal of Materials Science & Technology 1996年第5期12卷 398-400页

作者： Shourong LIU (Tianjin Institute of Hard alloy Tianjin 300222, China)Yi LIU (Shandong University Jinan 250100, China) Tianjin Institute of Hard alloy Tianjin 300222 China Shandong University Jinan 250100 China

Varying the morphology and the structure of γ-phase (Co-base Co-W-C solid solution) by means of altering the cooling rate and the preparing method of liquid sintered WC-Co cemented carbides samples, the mechanism of fcc→hcp transformation of γ-phase in WC-Co alloy has been explored. The results show that, the cooling rate is an important affecting factor on fcc→hcp transformation of γ-phase and the fcc→hcp transformation is mainly a diffusive type when cooling WC-Co samples above room temperature

关键词： WC Co Phase in Sintered WC-Co Cemented Carbides Transformation of

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镁合金压铸件在汽车行业中的巨大应用潜力

特种铸造及有色合金 2002年第S1期22卷 287-288页

作者：孙伯勤东北轻合金加工厂工学院

国外镁合金压铸件在 2 0 0 0年前将以 2 0 % ～ 2 5 %的速度增长 ,尤其在汽车行业需求量大。文中讲述镁合金压铸件特点和国外汽车行业对镁合金压铸件的需求情况。论述我国应抓住机遇 ,开发研制镁合金压铸件 ,迅速占领国内市场。

关键词：汽车镁合金压铸件