检索结果-南通市图书馆

Bulk ultrafine grained microstructures with high thermal stability via intragranular precipitation of coherent particles

引用

Journal of materials Science & Technology 2024年第14期181卷 220-230页

作者： Shenglong Liang Xiaochun Liu Suihe Jiang Huihui Zhu Wei Li Leqing Liu Xiongjun Liu Yuan Wu Xiaobin Zhang Hui Wang Zhaoping Lu Beijing Advanced Innovation Centre for materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Yangjiang Branch Guangdong Laboratory for Materials Science and Technology(Yangjiang Advanced Alloys Laboratory)Yangjiang 529500China Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410000China Liaoning Academy of materials Shenyang 110000China Inner Mongolia University of science and technology Instrumental Analysis CenterBaotou 014000China

Producing ultrafine-grained(UFG)microstructures with enhanced thermal stability is an important yet challenging route to further improve mechanical properties of structural ***,a high-performance bulk UFG copper that can stabilize even at temperatures up to 750℃(∼0.75 T m,T m is the melting point)was fabricated by manipulating its recrystallization behavior via low alloying of *** of 1 wt.%–1.5 wt.%of Co can trigger quick and copious intragranular clustering of Co atoms,which offers high Zener pinning pressure and pins the grain boundaries(GBs)of freshly recrystallized ul-trafine *** to the fact that the subsequent growth of the coherent Co-enriched nanoclusters was slow,sufficient particles adjacent to GBs remained to inhibit the migration of GBs,giving rise to the UFG microstructure with prominently high thermal *** work manifests that the strategy for pro-ducing UFGs with coherent precipitates can be applied in many alloy systems such as Fe-and Cu-based,which paves the pathway for designing advanced strain-hardenable UFGs with plain compositions.

关键词： Copper alloys Coherent precipitation ultrafine-grained materials Recrystallization Microstructural stability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Resolving the sintering conundrum of high-rhenium tungsten alloys

引用

Journal of materials Science & Technology 2023年第35期166卷 78-85页

作者： Zhongyou Que Xingyu Li Lin Zhang Xuanhui Qu Zichen Wei Chenguang Guo Haishen Sun Mingli Qin Gang Chen Peinan Du Yanhao Dong Beijing Advanced Innovation Center for materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Institute of materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Science and Technology on Reactor Fuel and materials Laboratory Nuclear Power Institute of ChinaChengdu 610213China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Tungsten-rhenium(W-Re)alloys with high-Re contents are the preferred refractory metal materials in many applications because of the improved ductility and processability over pure W and low-Re tung-sten ***,the sintering concurrently becomes increasingly more difficult with increasing Re *** we proposed that the sintering conundrum is caused by the lowered crystal symmetry and the wider dihedral angle distribution when body-center-cubic(BCC)W is alloyed with more hexagonal-close-packed(HCP)Re,which results in inefficient pore removal in the final stage *** showed that the conundrum can be resolved by pressureless two-step sintering(TSS)which suppresses acceler-ating final-stage grain growth,and our proposal is supported by the data of the critical densityρc that is required to start the second step for successful TSS at different W-Re *** ultrafine-grained W-Re alloys with∼300 nm average grain size and up to 25 wt%Re were successfully *** work demonstrates the unique opportunities offered by two-step sintering to advance the scientific understanding and technological practices in powder metallurgy and related fields.

关键词： W-Re alloys Two-step sintering Grain growth ultrafine-grained materials

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fabrication of ultrafine-grained AA1060 sheets via accumulative roll bonding with subsequent cryorolling

引用

Transactions of Nonferrous Metals Society of China 2021年第11期31卷 3370-3379页

作者： Qing-lin DU Chang LI Xiao-hui CUI Charlie KONG Hai-liang YU State Key Laboratory of High Performance Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China Light Alloys Research Institute Central South UniversityChangsha 410083China College of Mechanical Engineering Hunan Institute of Science and TechnologyYueyang 414000China Mark Wainwright Analytical Centre University of New South WalesSydneyNSW 2052Australia

ultrafine-grained(UFG)AA1060 sheets were fabricated via five-cycle accumulative roll bonding(ARB)and subsequent three-pass cold rolling(298 K),or cryorolling(83 K and 173 K).Microstructures of the aluminum samples were examined via transmission electron microscopy,and their mechanical properties were measured via tensile and microhardness *** indicate that ultrafine grains in ARB-processed sheets were further refined by subsequent rolling,and the grain size became finer with reducing rolling *** mean grain size of 666 nm in the sheets subjected to ARB was refined to 346 or 266 nm,respectively,via subsequent cold rolling or cryorolling(83 K).Subsequent cryorolling resulted in ultrafine-grained sheets of higher strength and ductility than those of the sheets subjected to cold rolling.

关键词： microstructure AA1060 sheet ultrafine-grained materials cryorolling accumulative roll bonding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Superplastic behavior of friction-stir welded Al-Mg-Sc-Zr alloy in ultrafine-grained condition

引用

Transactions of Nonferrous Metals Society of China 2022年第4期32卷 1083-1095页

作者： I.VYSOTSKIY K.KIM S.MALOPHEYEV S.MIRONOV R.KAIBYSHEV Belgorod National Research University Pobeda 85Belgorod 308015Russia

The present work was undertaken to improve superplastic ductility of friction-stir welded joints of ultrafine-grained(UFG)Al-Mg-Sc-Zr *** order to suppress the undesirable abnormal grain growth,which typically occurs in the heavily deformed base material,the UFG material was produced at elevated *** was suggested that the new processing route could reduce dislocation density in the UFG structure and thus enhance its thermal *** was found,however,that the new approach resulted in a relatively high fraction of low-angle boundaries which,in turn,retarded grain-boundary sliding during subsequent superplastic ***,despite the successful inhibition of the abnormal grain growth in the base-material zone,the superplastic deformation was still preferentially concentrated in the fully-recrystallized stir zone of the *** a result,the maximal elongation-to-failure did not exceed 700%.

关键词： aluminum alloys equal-channel angular pressing friction-stir welding ultrafine-grained materials superplasticity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Uniaxial compressive behavior of equal channel angular pressing Al at wide temperature and strain rate range

引用

Transactions of Nonferrous Metals Society of China 2014年第8期24卷 2447-2452页

作者：汤忠斌索涛张部声李玉龙赵峰范学领西北工业大学航空学院西安710072 西安交通大学航天航空学院西安710049

Uniaxial compressive experiments of ultrafine-grained Al fabricated by equal channel angular pressing(ECAP) method were performed at wide temperature and strain rate range. The influence of temperature on flow stress, strain hardening rate and strain rate sensitivity was investigated experimentally. The results show that both the effect of temperature on flow stress and its strain rate sensitivity of ECAPed Al is much larger than those of the coarse-grained Al. The temperature sensitivity of ultrafine-grained Al is comparatively weaker than that of the coarse-grained Al. Based on the experimental results, the apparent activation volume was estimated at different temperatures and strain rates. The forest dislocation interactions is the dominant thermally activated mechanism for ECAPed Al compressed at quasi-static strain rates, while the viscous drag plays an important role at high strain rates.

关键词： ultrafine-grained materials equal channel angular pressing Al mechanical behavior strain rate sensitivity temperature dependence activation volume

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：