|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Laser-based directed energy deposition of novel Sc/Zr-modified Al-Mg alloys:columnar-to-equiaxed transition and aging hardening behavior显示文摘The control of grain morphology is important in laser additive manufacturing(LAM),as grain morphology further affects the hot cracking resistance,anisotropy,and strength–ductility synergy of materials.To develop a solidification-control solution and achieve columnar-to-equiaxed transition(CET)in Al-based alloys during LAM,Sc-and-Zr-modified Al-Mg alloys were processed via directed energy deposition(DED).CET was achieved by introducing high potent primary Al_(3)(Sc,Zr)nucleation sites ahead of the solidification interface.Furthermore,the relationship between the solidification control parameters and precipitation behavior of primary Al_(3)(Sc,Zr)nucleation sites was established using the time-dependent nucleation theory.Then,the CET was studied according to the Hunt criterion.The results indicated that coarse columnar grain structure was still obtained at the inner region of the molten pool at low Sc/Zr contents owing to the effective suppression of the precipitation of the primary Al_(3)(Sc,Zr)nucleation sites via rapid solidification during DED.In addition,the relatively low melt temperature at the fusion boundary unavoidably promoted the precipitation of primary Al_(3)(Sc,Zr)nucleation sites,which resulted in a fine equiaxed grains band at the edge of the molten pool.As the Sc/Zr content increased,the solidification cooling rate was not sufficient to suppress the precipitation of the primary Al_(3)(Sc,Zr)nucleation sites,and a fully equiaxed grain structure was obtained.Furthermore,the effect of the layer-by-layer manufacturing process on the subsequent precipitation strengthening of secondary Al_(3)(Sc,Zr)precipitates was discussed.Both the remelting and subsequent aging during thermal cycling should be considered to achieve greater precipitation strengthening. | Zihong Wang Xin Lin Yao Tang Nan Kang Xuehao Gao Shuoqing Shi Weidong Huang | 2021 | Journal of Materials Science & Technology2021，，10： | 3 |
| 2 | Interfacial Characteristics and Mechanical Behavior of Hybrid Manufactured AlSi10Mg–Al6061 Bimetal via Selective Laser Melting and Forging显示文摘Hybrid manufacturing(HM)uses additive manufacturing(AM)techniques to prepare complex or fine structures on traditional processing parts,which can fully utilize the advantages of AM to form complex parts,and the high efficiency and low cost of conventional processing methods in manufacturing regular components.A bimetal material was produced by selective laser melting(SLM)of AlSi10Mg on the deformed Al6061 alloy substrate in this study.Firstly,the interface characteristics of the two alloys were studied.The results show that a metallurgical interface with a thickness of 100–200μm was formed as the result of the Marangoni convection during SLM preparation.In detail,the circular flow in the melt pool at the interface led to the dilution of alloying elements and the change of microstructure.Moreover,a suitable first-layer thickness can eff ectively suppress the hot cracks at the interfacial region.Based on the optimized results,the hybrid manufactured samples with diff erent SLM processed volume ratios(SLM-part)to the substrate were prepared to study the mechanical properties and the deformation behavior of hybrid parts.The results show that the volume ratio of the SLM-part to the substrate had an influence on the strength and the elasto-plastic behavior by aff ecting the distribution of plastic deformation. | Haoxiang Wang Xin Lin Nan Kang Zehao Qin Shuoqing Shi Jiacong Li Weidong Huang | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，3： | 1 |
| 3 | Isolation and Identification of Four Strains of Salmonella and Drug Susceptibility Test显示文摘In order to isolate and identify the pathogenic bacteria causing dead chickens in a chicken farm in Qinhuangdao area, the liver, heart and other organs of dead chickens suspected of salmonella disease were collected aseptically, and streaked on SS agar medium and chromagar medium. Transparent colonies were observed on SS agar medium, and purple and transparent colonies on CAS medium. The isolate was conducted purification, staining microscopy, biochemical tests, and 16 S rRNA sequence analysis, and the results showed that four strains of the isolated bacte-ria were salmonella. The 16 S rRNA sequence analysis of four strains of salmonella showed that the isolates shared more than 99% homology. Drug susceptibility test was performed using paper method, and the results showed that most of the strains were resistant to tilmicosin, cefradine and sul-famethoxazole, but were sensitive to ceftriaxone. | Guo Rui Ding Jialin Luo Junfeng Feng Ling Liu Zhiqiang Zhao Xiaocui Yao Weiping Gao Qingshan Fu Yanfang Su Shuoqing Shi Qiumei | 2019 | Animal Husbandry and Feed Science2019，11，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员