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Promoting dynamic recrystallization and improving strength and ductility of Mg-7Bi alloy through al addition

Journal of Magnesium and alloys 2024年第8期12卷 3339-3356页

作者： Gun Woong An Sang-Cheol Jin Hyun Ji Kim Sumi Jo Sung Hyuk Park Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Graduate School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

This study investigated the influence of the addition of al to a Mg-7Bi(B7,wt%)alloy,particularly its recrystallization behavior during extrusion and its resulting mechanical *** addition of 2 wt%al to the B7 alloy resulted in a lower grain size,a reduction in the number density of fine Mg3Bi2 particles,and a higher area fraction of relatively coarse Mg3Bi2 particles in the extrusion *** microstructural changes increased the nucleation sites for recrystallization,reduced the Zener pinning effect,and enhanced particle-stimulated nucleation,all of which promoted dynamic recrystallization behavior during *** a result,the area fraction of recrystallized grains in the extruded alloy increased from 77%to 94%.The extruded B7 alloy exhibited a strongfiber texture,whereas the extruded Mg-7Bi-2al(BA72)alloy had a weak-texture,which was attributed to the minimal presence of unrecrystallized grains and the dispersed orientation of the recrystallized *** tensile yield strength(TYS)of the extruded BA72 alloy was higher than that of the extruded B7 alloy(170 and 124 MPa,respectively),which resulted from the enhanced grain-boundary and solid-solution strengthening *** tensile elongation(EL)of the BA72 alloy also exceeded that of the B7 alloy(20.3%and 6.1%,respectively),the result of the uniform formation of fine twins under tension in the former and the formation of a few coarse twins among the unrecrystallized grains in the ***,the addition of a small amount of al to the B7 alloy significantly improved both the strength and ductility of the extruded alloy,resulting in a remarkable increase in the product of the TYS and EL from 756 to 3451 MPa%and expanding its potential range of applications as a lightweight extruded structural component.

关键词： Mg-7Bi alloy al addition Extrusion Recrystallization Microstructure

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Particle erosion of C/C-SiC composites with different al addition in reactive melt infiltrated Si

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Journal of Central South University 2020年第9期27卷 2557-2566页

作者： LIU Lei FENG Wei LI Bo-yan LI Jian-ping ZHANG Lei-lei GUO Yong-chun HE Zi-bo CAO Yi BAO Ai-lin School of Materials and Chemical Engineering Xi'an Technological UniversityXi’an 710021China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Particle erosion of C/C-SiC composites prepared by reactive melt infiltration with different al addition was studied by gas-entrained solid particle impingement ***,EDS and XRD were performed to analyze the composites before and after *** results indicate that a U shape relationship curve presents between the erosion rates and al content,and the lowest erosion rate occurs at 40 wt%*** for the important influence of compactness,the increasing soft al mixed with reactive SiC,namely the mixture located between carbon and residual Si also,plays a key role in the erosion of the C/C-SiC composites through crack deflection,plastic deformation and bonding cracked Si.

关键词： C/C-SiC al addition reactive melt infiltration solid particle erosion

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Precipitation evolution and properties of Cu-15Ni-8Sn alloys via al microalloying during ageing

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Rare Metals 2024年第10期43卷 5216-5228页

作者： Wei Luo Li-Jun Peng Xu-Jun Mi Hao-Feng Xie Yi-Cheng Cao Shu-Hui Huang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

Studies have shown that microalloying Cu-Ni-Sn alloys using al inhibits discontinuous precipitation reactions;however,the mechanism has not been investigated ***,this study explored the properties and precipitation evolution of Cu-15Ni-8Sn alloys without and with 1 wt%al(Cu-15Ni-8Sn-1al)during ageing at 500℃ through X-ray diffraction(XRD),scanning electron microscopy and high-angle annular dark-field scanning transmission electron *** results revealed that in Cu-15Ni-8Sn alloy,DO_(22)ordering first occurred after spinodal decomposition,subsequently transitioning to an L1_(2)ordering phase,during which the discontinuous precipitates gradually nucleated at the grain boundaries and formed *** alloy hardness increased sharply with ordering and then decreased rapidly after reaching its peak value,due to the dominance of the discontinuous precipitation ***,the DO_(22)ordered phase did not appear during the ageing of Cu-15Ni-8Sn-1al alloy,and a Ni_(3)(al_(x),Sn_(1-x))intermetallic compound with L1_(2)structure was formed,consuming Ni and Sn atoms,thereby significantly suppressing the discontinuous precipitation reaction and improving the stability during prolonged *** tensile strength(yield strength)of Cu-15Ni-8Sn and Cu-15Ni-8Sn-1al alloys at peak hardness were 855(755)and 936 MPa(892 MPa),respectively,and their main strengthening mechanisms were solid solution strengthening and precipitation *** addition of 1 wt%al effectively improved the precipitation strengthening effect of Cu-Ni-Sn alloys but severely decreased the ductility.

关键词： Cu-15Ni-8Sn al addition Precipitation sequence Strengthening mechanism

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Effect of al on microstructure and mechanical properties of cast CrCoNi medium-entropy alloy

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China Foundry 2018年第4期15卷 253-262页

作者： Qiang Hu Fu-chu Liu Qian-lu Fan Hui Du Gang Liu Guang-hua Wang Zi-tian Fan and ＊Xin-wang Liu State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Department of Mechanical Engineering Wuhan University of Science and TechnologyWuhan 430081China School of Materials Science and Engineering Xi'an University of technologyXi’an 710048China

Cast CrCoNiAIx （x=0-1.2） medium-entropy alloys （MEAs） were produced by arc melting and flip cast to investigate the alloying effect of AI addition on the microstructure, phase constituent and mechanical properties. The crystal structure changes from an initial face-centered cubic （FCC） to duplex FCC and body-centered cubic （BCC） and finally a single BCC with increasing AI content. In the duplex region, FCC and BCC phases form under a eutectic reaction in the interdendrite region. In the single BCC region, the dendrites transform to ordered B2 and disordered A2 BCC phases resulting from spinodal decomposition. Corresponding to their phase constituents, yield strength increases accompanied with an elongation reduction with increasing AI addition. A very interesting phenomenon of very weak ordered FCC （001） spots appearing in AI-0.4 alloy was observed, indicating a local ordering of FCC phase. The changes of fracture surfaces after the tensile deformation are also corresponding to the variations in mechanical properties.

关键词： medium-entropy alloy microstructure mechanical properties al addition

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Microstructure and transformation behavior of Ni_(54)Mn_(25)Ga_(15)al_6 high-temperature shape memory alloy

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Transactions of Nonferrous Metals Society of China 2014年第1期24卷 126-130页

作者：辛燕李岩华北电力大学能源动力与机械工程学院北京102206 北京航空航天大学材料与工程学院北京100191

The microstructure, martensitic transformation behavior, mechanical properties and shape memory effect of Ni54Mn25Ga15al6 high-temperature shape memory alloy were investigated. By comparing with the Ni54Mn25Ga21 alloy, the effect of al addition on the properties of Ni-Mn-Ga alloys was analyzed. The results show that the Ni54Mn25Ga15al6 alloy has a single-phase tetragonal non-modulated martensite structure with lamellar twins. The martensitic transformation start temperature of this alloy is up to 190 ℃, displaying the promising application as a high-temperature shape memory alloy. al addition in Ni-Mn-Ga alloy can decrease the martensitic transformation temperatures due to the effect of size factor and improve the strength and plasticity. However, the shape memory effect is reduced remarkably with the al addition.

关键词： Ni-Mn-Ga shape memory alloy Ni-Mn-Ga al addition martensitic transformation

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