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| 1 | Effects of Alumina on Cristobalite Crystallization and Properties of Silica-Based Ceramic Cores显示文摘In this work, the influences of alumina addition on cristobalite crystallization and properties of injection molded silica-based ceramic cores were investigated. X-ray diffraction(XRD) was used to characterize phase transformations in the samples, and the XRD result indicated that the addition of alumina promoted crystallization of fused silica during sintering at 1180–1220 °C and thus increases the amount of cristobalite. The increased amount of cristobalite as well as alumina addition led to much more thermal dilation due to their higher coefficients of thermal expansion than that of fused silica. The flexural strengths at room temperature and 1500 °C were tested, and it was shown that alumina addition could not affect room temperature strength, but decreased the flexural strength at 1500 °C. In addition, deflection resistance during heating to high temperatures was investigated, and the result indicated that alumina addition speeded up high temperature softening of the samples. XRD and scanning electron microscopy equipped with energy dispersive spectrometry(SEM/EDS) analysis suggested that this softening behavior was related with viscous flow sintering which could be accelerated by the reaction of alumina and silica with a product of mullite. | J.J.Liang Q.H.Lin X.Zhang T.Jin Y.Z.Zhou X.F.Sun B.G.Choi I.S.Kim J.H.Do C.Y.Jo | 2017 | Journal of Materials Science & Technology2017，33，2： | 14 |
| 2 | Microstructural Evolution in Directionally Solidified Ni-Base Superalloy IN792+Hf显示文摘微结构进化在 gamma'precipitates 和 MC 类型碳化物上与一个重音在 Ni 底超级合金 IN792+Hf 的方向性的团结(DS ) 期间被调查了。量的图象分析表明团结的增加在 178 K/cm 的经常的热坡度评价直到 100 亩 m/s 导致了罚款和在当演员组 7'size 和冷却的率之间的 gamma'precipitates.The 关系的一致分发也为 DS IN792+Hf.In 被决定吝啬的时间,当 MC 碳化物的区域部分被 S/L 接口形态学显著地影响时, MC 碳化物尺寸被发现两个都依赖于团结率和 S/L 接口形态学。 | S.M.Seo I.S.Kim J.H.Lee C.Y.Jo H.Miyahara K.Ogi | 2008 | Journal of Materials Science & Technology2008，24，1： | 3 |
| 3 | Microstructural Stability of a Single Crystal Superalloy DD8 during Thermal Exposure显示文摘五分钱底单身者水晶合金 DD8 的微结构稳定性被调查了。标准热对待在在当演员组下面的 950 ° C .While 的显示出的好微结构稳定性调节的标本,一种像杆的阶段猛抛在内部当演员组标本的树枝状的区域在热暴露期间。阶段,让电子消息传输方式组织,与也预言的 Cr.Thermo 计算被充实在 Cr 富有的电子消息传输方式分阶段执行的约 950 ° C .The 的一个电子消息传输方式阶段的降水被看作 alpha-Cr 并且在当演员组条件下面由于 Cr 的分离形成了。 | K.Y.Cheng D.H.Kim Y.S.Yoo C.Y.Jo T.Jin Z.Q.Hu | 2008 | Journal of Materials Science & Technology2008，24，1： | 2 |
| 4 | Effect of Re Addition and Withdrawal Rate on the Solidification Behavior of Directionally Solidified Superalloy AM3显示文摘The influence of Re addition and withdrawal rate on the solidification behavior of the first generation single crystal superalloy AM3 was investigated by directional solidification and quenching experiments.The primary dendrite arm spacing and eutectic volume fraction were measured from directionally solidified superalloy AM3 with different Re contents.It is found that the primary dendrite arm spacing is determined by the withdrawal rate,and Re does not influence on the value.The eutectic fraction increases with increasing Re addition.Partition coeffcients of alloying elements were investigated with energy-dispersive X-ray spectrometry(EDS) analysis.The data was submitted to a statistical treatment to establish the solidification path,and the partition coeficients were measured by fitting the curve with a modified Scheil formula.It is shown that the addition of Re results in bigger microsegregation of alloying elements in directionally solidified AM3 superalloy. | F.Long Y.S.Yoo S.M.Seo T.Jin Z.Q.Hu C.Y.Jo | 2011 | Journal of Materials Science & Technology2011，27，2： | 2 |
| 5 | 热暴露下预应变对CMSX-4单晶高温合金的显微组织演变的影响(英文)显示文摘在室温下,对经完全热处理的第二代单晶高温合金CMSX-4实施压缩和拉伸预应变。压缩和拉伸预应变在单晶CMSX-4中产生了剪切带。单晶CMSX-4在950℃下热暴露10h,沿剪切带产生了γ′粒子择优粗化。剪切带上的γ′粒子逐渐侵入γ通道。最后,γ通道沿着剪切带消失。TCP状粒子伴随着γ通道的消失而出现。然而,热暴露10h的普通单晶CMSX-4没有产生TCP沉淀,也没有γ′粒子择优粗化。热暴露100h的预应变CMSX-4沿剪切带产生了γ′粒子和TCP相粒子择优粗化,基体中也有γ′粒子粗化。 | B.G.CHOI C.Y.JO I.S.KIM S.M.SEO H.M.KIM | 2011 | Transactions of Nonferrous Metals Society of China2011，21，6： | 0 |
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