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Effect of carbon addition on creep behavior of cast TiAl alloy with hard-oriented directional lamellar microstructure

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Journal of Iron and Steel Research(International) 2020年第11期27卷 1347-1356页

作者： Xi-wen Zhang Yu-ling Tang Wen-juan Wan Chun-lei Zhu Ji Zhang Beijing Key Laboratory of Advanced High Temperature Materials China Iron and Steel Research Institute GroupBeijing 100081China National Center for Electron Microscopy in Beijing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Two TiAl alloys,Ti-47.5Al-3.7(Cr,V,Zr)and Ti-47.5Al-3.7(Cr,V,Zr)-0.1C(at.%),were prepared by cold crucible levitation melting to couple the hard-oriented directional lamellar microstructure with carbon microalloying *** creep behavior and mechanism for the improvement in creep properties by carbon addition were investigated by mechanical tests and electron microscopy *** results show that obvious improvements on the creep properties at 760°C and 276 MPa are achieved by 0.1 at.%C addition into TiAl alloy with directional lamellar microstructure,which promotes the creep strain and minimum creep rate decreasing with a large *** minimum creep rate is reduced from 4.37×10^(-8) to 3.97×10^(-9) s^(-1),and the duration entering into creep acceleration is prolonged for more than 10 *** mechanism for creep property improvement by 0.1%C addition is attributed to two *** first one is that Ti_(2) AlC is found to be strong obstacles of 1/2[110]dislocations when moving across the lamellar interface in the carbon containing *** other one is that the in terfacial dislocatio ns are effectively impeded and the release process is hindered by dynamic precipitation of Ti_(3) AlC,which is proposed to be the special mechanism for creep resistance improvement of this hard-oriented directional lamellar microstructure.

关键词： Cast titanium aluminide Lamellar microstructure Creep behavior carbon addition Dynamic precipitation

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Effect of carbon addition on Microstructure and Properties of WC-Co Cemented Carbides

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Journal of Materials Science & Technology 2012年第9期28卷 837-843页

作者： Chongbin Wei Xiaoyan Song Jun Fu Xiaosen Lv Haibin Wang Yang Cao ShixianZhao Xuemei Liu College of Materials Science and Engineering Key Lab of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 100124China Beijing Belying Hardalloy Co. Ltd.Beijing 100055China

Based on a unique method to synthesize WC-Co composite powder by in-situ reactions of metal oxides and carbon, the effects of the carbon addition in the initial powders on the phase constitution, microstructure and mechanical properties of the cemented carbides were investigated. It is found that with a suitable carbon addition the pure phase constitution can be obtained in the sintered bulk from the composite powder. The mechanical properties of the cemented carbides depend on the phase constitution and the WC grain structure. To obtain the excellent properties of the WC-Co bulk, it is important to obtain the pure phase constitution from the appropriate carbon addition in the initial powders and a suitable grain size.

关键词： Cemented carbides carbon addition Composite powder Phase constitution Mechanical property

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Influence of carbon on the giant magnetocaloric effect of LaFe_11.7Si_1.3

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Rare Metals 2006年第5期25卷 556-561页

作者： LI Junqin LIU Fusheng AO Weiqin ZHUANG Yinghong ZHOU Kaiwen Department of Materials Science and Engineering Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials Shenzhen518060 China Key laboratory of Nonferrous Metal Materials and New Processing Technology Ministry of Education Guangxi University Nanning 530004China

The influences of carbon on phase formation, Curie temperature, and magnetic entropy change of the NaZn13-type LaFe11.7Si1.3 were investigated. Seven carbon-containing alloys, LaFe11.7Si1.3Cx with x = 0, 0.03, 0.06, 0.10, 0.20, 0.30, and 0.50, respectively, were prepared for this investigation. Experimental results show that addition of a small amount of carbon in LaFe11.7Sil.3 is favorable for the formation of the NaZn13-type structure of LaFe11.7Si1.3Cx. The lattice constant increases with C addition and x increases in the alloy because of the introduction of C as interstitial atoms. The Curie temperature of LaFe11.7Si1.3Cx increases from 194 K to 225 K as x increases from 0 to 0.5. Large magnetic entropy changes were observed in these carbon-containing alloys LaFe11.7Si1.3Cx because of their first-order structural/magnetic transition. The maximum magnetic entropy change of 27.5 ***^-1K^-1 at 202 K for the 0-1.56 T magnetic field change was observed in the alloy with x = 0.06. The large magnetic-entropy changes corresponding to low magnetic field change, and the low cost of the material of LaFe11..7Si1.3Cx makes it a promising candidate to be used as magnetic refrigerants in the corresponding temperature range.

关键词： LaFe11.7Si1.3 carbon addition magnetocaloric effect

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