- Effect of B4C Content on the Sintering Characteristics of 6061Al-B4C Composite Powder
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Jin-Ju Park, Sung-Mo Hong, Kyoung-Yeol Kim, Min-Ku Lee, Chang-Kyu Rhee, Won-Hyuk Rhee, Yang Kyu Lee
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J Korean Powder Metall Inst. 2013;20(3):215-220.
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DOI: https://doi.org/10.4150/KPMI.2013.20.3.215
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 Abstract
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- In the present work, 6061 Al-B_4C sintered composites containing different B_4C contents were fabricated and their characteristic were investigated as a function of sintering temperature. For this, composite powders and their compacts with B_4C various contents from 0 to 40 wt.% were fabricated using a planetary ball milling equipment and cold isostatic pressing, respectively, and then they were sintered in the temperature ranges of 580 to 660°C. Above sintering temperature of 640°C, real density was decreased due to the occurrence of sweat phenomena. In addition, it was realized that sinterability of 6061Al-B_4C composite material was lowered with increasing B_4C content, resulting in the decrease in its real density and at the same time in the increment of porosity.
- Effect of Heat Treatment on the Microstuctures and Mechanical Properties of TiC Dispersed Ni-base Alloy
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Seong-Hyeon Hong, Keum-Chul Hwang, Won-Hyuk Rhee, Eog-Yong Chin
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J Korean Powder Metall Inst. 2002;9(6):455-462.
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DOI: https://doi.org/10.4150/KPMI.2002.9.6.455
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Abstract
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- The microstructures and properties of TiC dispersed nickel-base alloy were studied in this work. The alloy prepared by powder metallurgical processing was solution treated, 1st-aged at 880°C for 16 hours, and then 2nd-aged at 760°C for 4 hours. Microstucture of sintered specimen showed that TiC particles are uniformly dispersed in Ni base alloy. In the specimen aged at 880°C for 8 hours, the fine gammaNi_3(Al,Ti) precipitates with round shape are observed and the very fine gammaNi_3(Al,Ti) particles with round shape are precipitated in the specimen aged at 760°C for 4 hours. The presence of gammaprecipitates in TiC/Ni base alloy increased the hardness and wear resistance of the specimen. The hardness and wear resistance of the Ni-base with TiC are higher than those of conventional Ni-base superalloy X-750 because of dispersion strengthening of TiC particles. The hardness, transverse rupture strength and resistance of the specimen 2nd-aged at 760°C for 4 hours are higher than those of 1st-aged specimen due to ultrafine gammaNi_3(Al,Ti) precipitates.
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