A typical trade-off relationship exists between strength and elongation in face-centered cubic metals. Studies have recently been conducted to enhance strength without ductility reduction through surface-treatment-based ultrasonic nanocrystalline surface modification (UNSM), which creates a gradient microstructure in which grains become smaller from the inside to the surface. The transformation-induced plasticity effect in Fe-Mn alloys results in excellent strength and ductility due to their high work-hardening rate. This rate is achieved through strain-induced martensitic transformation when an alloy is plastically deformed. In this study, Fe-6%Mn powders with different sizes were prepared by high-energy ball milling and sintered through spark plasma sintering to produce Fe-6%Mn samples. A gradient microstructure was obtained by stacking the different-sized powders to achieve similar effects as those derived from UNSM. A compressive test was performed to investigate the mechanical properties, including the yielding behavior. The deformed microstructure was observed through electron backscatter diffraction to determine the effects of gradient plastic deformation.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
4. 결 론
감사의 글
References

• 서남혁(전북대학교 신소재공학부) | Namhyuk Seo (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 이준호(전북대학교 신소재공학부) | Junho Lee (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 신우철(전북대학교 신소재공학부) | Woocheol Shin (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 전준협(전북대학교 신소재공학부) | Junhyub Jeon (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 박정빈(전북대학교 신소재공학부) | Jungbin Park (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 손승배(전북대학교 신소재공학부) | Seung Bae Son (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 정재길(전북대학교 신소재공학부) | Jae-Gil Jung (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea)
• 이석재(전북대학교 신소재공학부) | Seok-Jae Lee (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea) Corresponding author