The objective of this study is to investigate the influence of powder shape and densification mechanism on the microstructure and mechanical properties of Ti-6Al-4V components. BE powders are uniaxially and isostatically pressed, and PA ones are injection molded because of their high strengths. The isostatically compacted samples exhibit a density of 80%, which is higher than those of other samples, because hydrostatic compression can lead to higher strain hardening. Owing to the higher green density, the density of BE-CS (97%) is found to be as high as that of other samples (BE-DS (95%) and P-S (94%)). Furthermore, we have found that BE powders can be consolidated by sintering densification and chemical homogenization, whereas PA ones can be consolidated only by simple densification. After sintering, BE-CS and P-S are hot isostatically pressed and BE-DS is hot forged to remove residual pores in the sintered samples. Apparent microstructural evolution is not observed in BE-CSH and P-SH. Moreover, BE-DSF exhibits significantly fine grains and high density of low-angle grain boundaries. Thus, these microstructures provide Ti-6Al-4V components with enhanced mechanical properties (tensile strength of 1179 MPa).

Abstract
1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
References

• 이성호(국방과학연구소) | Sung Ho Lee (Agency for Defense Development)
• 송영범(국방과학연구소) | Young-Beom Song (Agency for Defense Development)
• 권영삼(㈜쎄타텍) | Young-Sam Kwon (Cetatech Inc)
• 김영무(국방과학연구소) | Youngmoo Kim (Agency for Defense Development) Corresponding Author