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High density dislocations enhance creep ageing response and mechanical properties in 2195 alloy sheet

Journal of Central South University 2024年第7期31卷 2194-2209页

作者： WEI Shuo MA Pei-pei CHEN Long-hui YANG Jian-shi ZHAN Li-hua LIU Chun-hui Light Alloy Research Institute Central South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Advancd Research Center Central South UniversityChangsha 410083China Light Alloy Research

The creep strain of conventionally treated 2195 alloy is very low,increasing the difficulty of manufacturing Al-Cu-Li alloy sheet parts by creep age ***,finding a solution to improve the creep formability of Al-Cu-Li alloy is vital.A thorough comparison of the effects of cryo-deformation and ambient temperature large pre-deformation(LPD)on the creep ageing response in the 2195 alloy sheet at 160℃with different stresses has been *** evolution of dislocations and precipitates during creep ageing of LPD alloys are revealed by X-ray diffraction and transmission electron ***-quality 2195 alloy sheet largely pre-deformed by 80%without edge-cracking is obtained by cryo-rolling at liquid nitrogen temperature,while severe edge-cracking occurs during room temperature *** creep formability and strength of the 2195 alloy are both enhanced by introducing pre-existing dislocations with a density over 1.4×10^(15)m^(−2).At 160℃and 150 MPa,creep strain and creep-aged strength generally increases by 4−6 times and 30−50 MPa in the LPD sample,respectively,compared to conventional T3 alloy *** elongation of creep-aged LPD sample is low but remains relevant for *** high-density dislocations,though existing in the form of dislocation tangles,promote the formation of refined T1 precipitates with a uniform dispersion.

关键词： creep ageing Al-Cu-Li alloy high dislocation density cryogenic rolling dislocation strengthening

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dislocation-Induced Precipitation and Its strengthening of Al–Cu–Li–Mg Alloys with High Mg

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Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 597-605页

作者： Xiangpeng Gong Shifang Luo Shiyong Li Cuilan Wu Center for High-Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha410082China

Generally, the good combination of pre-deformation and aging can improve the mechanical strength of the Al–Cu–Li–Mg alloys. However, the effects of pre-deformation on competitive precipitation relationship and precipitation strengthening have not been clarified in detail in Al–Cu–Li–Mg alloys with high Mg. In the present study, the effects of pre-deformation level on the microstructure and mechanical properties of an Al–2.95 Cu–1.55 Li–0.57 Mg–0.18 Zr alloy have been investigated. It is found that the introduction of dislocation by 5% pre-deformation can facilitate the precipitation of new successive composite precipitates and T _1 precipitates along the sub-grain boundaries or dislocations and inhibit the precipitation of dispersive GPB zones which is the main precipitates of the alloys without pre-deformation. The introduction of 5% pre-deformation can enhance the mechanical properties considerably. When the pre-deformation level increases from 5 to 15%, the number density of the successive composite precipitates and T _1 precipitates increases, and the aspect ratio of T _1 precipitates decreases. The decrease in T _1 precipitate aspect ratio and the increment of the successive composite precipitates result in the reduction in precipitation strengthening. Therefore, the increase in pre-deformation level from 5 to 15% does not further improve the mechanical properties of the alloys, although the dislocation strengthening increases continuously.

关键词： Aluminum alloys Precipitation behavior Pre-deformation Precipitation strengthening dislocation strengthening

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Elevated Temperature Strength of TiC_(p)/W Composites

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Journal of Materials Science & Technology 2001年第1期17卷 31-32页

作者： Yujin WANG Yu ZHOU Guiming SONG Tingquan LEI School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The elevated temperature mechanical properties of TiCp,/W composites produced using powder metallurgical technique were investigated. Results show that with increasing temperature, the strength of TiCp/W composites increases gradually and reaches its maximum value at 1000℃, which is much higher than that at room temperature. The strengthening mechanisms at high temperature are attributed to dislocation strengthening and load transfer between matrix and particles.

关键词： dislocation strengthening mechanical properties elevated temperature room temperature high temperature maximum value load transfer strength of

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High Temperature Tensile Properties of 30 vol. pct ZrCp/W Composite

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Journal of Materials Science & Technology 2003年第2期19卷 167-170页

作者： Yujin WANG, Yu ZHOU, Guiming SONG and Tingquan LEISchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China Sch. of Mat. Sci. and Eng. Harbin Inst. of Technol. Harbin 150001 China

In order to improve the high temperature strength of tungsten, 30 vol. pct ZrC particles were added to the tungsten matrix to form a 30ZrCp/W composite. The tensile properties from 20C to 1880C of the composite were examined. It was shown that with increasing testing temperature, the nonlinearity of the stress strain curve of 30ZrCp/W composite becames obvious over 1200C and the Young’s modulus decreases and the elongation increases. The ultimate tensile strength increases at first and then decreases with increasing testing temperature. The maximum strength of 431 MPa was obtained at 1000C. The strengthening mechanism at high temperatures is the load transfer to ZrC particles and dislocation strengthening of the tungsten matrix with an effect of grain boundary strengthening.

关键词： ZrCp/W composite Tensile strength High temperature strengthening mechanism Load transfer dislocation strengthening

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Microstructures and Mechanical Properties of TiC Particle Reinforced TiAl Composites by Spark Plasma Sintering

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Journal of Wuhan University of Technology(Materials Science) 2007年第2期22卷 291-294页

作者：岳云龙 School of Materials Science and Engineering Jinan University

Using spark plasma sintering（SPS） technique, TiC particle reinforced γ-TiAl composites were prepared with varying weight fraction of TiC powders. The effects of the TiC fractions and distributions on the properties of the composites were investigated. The composite containing 7wt% TiC had the optimum three-point bending strength of 842 MPa,which was 200 MPa greater than that of the unreinforced γ-TiAl intermetallic. The degradation of the bending strength occurred in the composites containing more than 7wt% TiC and this was believed to be attributed to agglomerated particles of TiC, which acted as crack initiation and propagation sites. The increase of strength in TiC reinforced IMCs came from the grain refinement and the interaction of dislocations with the reinforcing particles. The bending strength of the IMC containing 7wt% TiC was theoretically estimated to increase by 85 MPa and 200 MPa, respectively, by the grain refinement and dislocation strengthening, the total of which was ahnost in accordance with the improvement in that of the unreinforced γ-TiAl intermetallic when considering normal estimation errors.

关键词： TiC / TiAl composites mechanical properties grain refinement dislocation strengthening SPS sintering technique

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Explore the strengthening Mechanisms of the Ultra-Low Carbon and Low Alloy Steel

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Journal of Iron and Steel Research(International) 2011年第S1期18卷 346-349页

作者： LIU Pan 1,2,LI Hong-mei 1,2,LIU Rong-pei 1,BAO Yao-zong 2 (1.Kunming University of Science and Technology Kunming,Yunnan 650093,China 2.Central Iron and Steel Research Institute,Beijing 100081,China) Kunming Univ Sci & Technol Kunming 650093 Yunnan Peoples R China Cent Iron & Steel Res Inst Beijing 100081 Peoples R China

Room temperature tensile tests were carried on the hot-rolled state ultra-low carbon and low alloy cabainite and martensite steels which were get by different finishing temperatures and different cooling *** used the Scanning Electron Microscopy (SEM),Electron Backscattered Diffraction (EBSD) and X-Ray Diffractometer (XRD) to identify the metallographic structure and analyse the precipitated *** inherent mechanism of high strength of ultra-low carbon and low alloy bainite and martensite steels was discussed,and the analysis indicated that the reinforcement of ultra-low carbon and low alloy bainite and martensite steels was mainly produced by the superposition of the dislocation strengthening,solution strengthening and grain refinement strengthening.

关键词： ultra-low carbon low alloy bainite martensite steel dislocation strengthening solution strengthening fine-grain strengthening precipitation strengthening

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