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| 1 | Comparison of microstructure and mechanical behavior of Ti-35Nb manufactured by laser powder bed fusion from elemental powder mixture and prealloyed powder显示文摘Although different types of powder feedstock are used for additive manufacturing via laser powder bed fusion(L-PBF),limited work has attempted to directly compare the microstructure and mechanical behavior of components manufactured from those powder feedstock.This work investigated the microstructure,phase composition,melt pool morphology,and mechanical properties of a prealloyed Ti-35Nb alloy manufactured using L-PBF and compared these to their counterparts produced from elemental powder mixture.The samples manufactured from the powder mixture are composed of randomly distributed undissolved Nb in theα/βmatrix,resulting from the unstable melt pool during the melting of the powder mixture.By contrast,parts produced from prealloyed powder display a homogeneous microstructure withβandαphases,owing to the full melting of prealloyed powder,therefore,a more stable melt pool to achieve a homogeneous microstructure.The Ti-35Nb manufactured from prealloyed powder exhibits large tensile ductility(about 10 times that of the counterparts using mixed powder),attributed to the high homogeneity in microstructure and chemical composition,strong interface bonding,relatively low oxygen content,and the existence of a large amount ofβphase.This work sheds insights into understanding the effect of powder feedstock on the melt pool stability therefore the microstructure and mechanical behavior of the resultant parts. | J.C.Wang Y.J.Liu S.X.Liang Y.S.Zhang L.Q.Wang T.B.Sercombe L.C.Zhang | 2022 | Journal of Materials Science & Technology2022，，10： | 4 |
| 2 | STUDY OF TCP PHASE PRECIPITATING IN GH4199 SUPERALLOY显示文摘The precipitating regulation and mechanism of TCP phase (μ phase and σ phase) are studied, using electron hole number (EHN) theory, phase analysis technology and TEM observation. The results indicate that the EHN in studied alloy is 2.311-2.348 which is higher than that of critical EHN of μ phase precipitate (2.30), so μ phase could precipitate if there is enough thermo-exposition. In contrast, the calculated EHN is less than that of critical EHN of σ phase precipitate (2.52). However the σ phase is also observed by TEM. Enrich of Cr and Mo around γ phase after γ′phase precipitated leads to σ phase precipitated. | T.Cui Y.S.Zhang S.W.Guo L.Wang H.C.Yang | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，5： | 3 |
| 3 | The recent development of C02 fixation and conversion by ionic liquid显示文摘 | Zhang J.M Sun J Zhang X.C Zhao Y.S.Zhang S.J | | 0，，： | 1 |
| 4 | Novel urchin-like CuO synthesized by a facile reflux method with efficient Olefin epoxidation catalytic performance显示文摘 | L.P.Xu S.Sithambaram Y.S.Zhang | | 0，，： | 1 |
| 5 | 青藏高原东北缘岩石层结构:高原横向生长的机制显示文摘青藏高原东北缘及其周边亚洲板块(北部到阿拉善块体,东部到鄂尔多斯块体)岩石层结构的探测对了解青藏高原的抬升和横向生长具有重要的意义。本研究利用布设在青藏高原东北缘和周边区域的高密度地震台阵所记录的波形,计算S波和P波接收函数,研究岩石层结构。结果表明,鄂尔多斯块体和阿拉善块体下方的地幔岩石层中存在较强、相对稳定的负速度梯度,其深度范围在70~150km,这与典型稳定的大陆岩石层类似;相比之下,在青藏高原东北部下方地幔岩石层的速度梯度相对较弱和较模糊,这可能是由于地幔岩石层高温和存在部分熔融物质造成的;青藏高原与鄂尔多斯块体和阿拉善块体边界之间的岩石层结构变化剧烈,这两个块体作为刚性边界限制了青藏高原的横向变化。此外,在青藏高原东北角到银川地堑区域的地幔岩石层结构是相似的,这可能意味着从青藏高原东北角到鄂尔多斯块体和阿拉善块体之间的过渡间隔区内存在横向地幔流。这个过渡带的地壳结构为青藏高原横向生长提供了证据。特别是,在海原断裂和天景山断裂之间出现了地壳增厚和双地壳的证据,该区域可能是青藏高原在东北缘横向生长的前沿。 | X.Z.Shen M.Liu Y.Gao W.J.Wang Y.T.Shi M.J.An Y.S.Zhang X.Z.Liu 钱银苹(译) 李敏娟(译) 沈旭章(校) | 2018 | 世界地震译丛2018，49，2： | 0 |
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