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Evaluation of Repetitively Used Feedstock for Powder Injection Molding

Jin Man Jang
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 4 | 1511-1515 | DOI: 10.24425/amm.2022.141084
Keywords powder injection molding recycling rheology homogeneity feedstock
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Abstract

This study investigates the effects of repetitive injection molding on the properties of feedstock using the AISI 4140 feedstock. The properties of feedstock are evaluated from the mixing homogeneity of powder and binder, rheological properties, and dimensional accuracy of parts sintered. The feedstock after the 1st injection molding shows a better homogeneity than as-received feedstock due to re-mixing effects between the screw and barrel during the injection molding process. As the number of recycling numbers increases, the homogeneity, viscosities ad shrinkage ratio of recycled feedstocks show slight differences with those of the as-received feedstock until the 6th molding injection. However, some rheological parameters like the moldability index sharply increased up to the 4th injection but shows a tendency to decrease thereafter.
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Authors and Affiliations

Jin Man Jang
1 2
ORCID: ORCID
  1. Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea
  2. Inha University, Department of Materials Science and Engineering, Incheon, 22212, Republic of Korea

The Effects of Grain Boundary Structures on Mechanical Properties in Nanocrystalline Al Alloy

Jin Man Jang Wonsik Lee Se-Hyun Ko
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 971-975 | DOI: 10.24425/amm.2021.136408
Keywords nanocrystalline Al alloy Young’s modulus hardness nanoindentation low and high angle grain boundary
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Abstract

This study investigates the effects of grain boundary structures on mechanical properties of nanocrystalline Al-0.7Mg-1.0Cu alloy using nanoindentation system. Grain boundary structure transforms to high angle grain boundaries from low angle ones with increase of heat treatment temperature and the transformation temperature is about 400℃. Young’s modulus and hardness are higher in sample with low angle grain boundaries, while creep length is larger in sample with high angle ones. These results indicate that progress of plastic deformation at room temperature is more difficult in sample with low angle ones. During compression test at 200℃, strain softening occurs in all samples. However, yield strength in sample with low angle grain boundaries is higher twice than that with high angle ones due to higher activation energy for grain boundary sliding.
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Authors and Affiliations

Jin Man Jang
1 2
ORCID: ORCID
Wonsik Lee
1
ORCID: ORCID
Se-Hyun Ko
1
ORCID: ORCID
  1. Korea Institute of Industrial Technology, Incheon, 21999, Republic of Korea
  2. Inha University, Department of Materials Science and Engineering, Incheon, 22212, Republic of Korea

Effects of SiC Coating of Carbon Fiber on Mechanical Properties in Short Carbon Fiber Reinforced Al Matrix Composite

Jin Man Jang Se-Hyun Ko Wonsik Lee
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 941-946 | DOI: 10.24425/amm.2021.136401
Keywords Short carbon fiber Al composite SiC coating mechanical property
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Abstract

A356 Al composites reinforced by short carbon fiber were prepared through the 2-step process: fabrication of a composite precursor and ultrasonication of the precursor melt. The short carbon fibers were coated with 0.15~1.5 μm thick SiC layer by a carbothermal reaction, and an amount of the carbon fiber reinforcement was determined to be 1.5 vol.% and 4.0 vol.%, respectively. The addition of the carbon fiber increased the hardness of A356 alloy. However, tensile strength did not increase in the as-cast composites regardless of the SiC coating and volume fraction of the carbon fiber, due to the debonding which reduced load transfer efficiency from matrix to fiber at the interface. After T6-treatment of the composites, a significant increase in strength occurred only in the composite reinforced by the SiC-coated short carbon fiber, which was considered to result from the formation of a precipitate improving the Al/SiC interfacial strength
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Authors and Affiliations

Jin Man Jang
1
ORCID: ORCID
Se-Hyun Ko
1
ORCID: ORCID
Wonsik Lee
1
ORCID: ORCID
  1. Advanced Materials and Process R&D Department, Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea

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