소개글
1. ObjectThe purpose of this experiment is understanding the meaning of variables at powder metallurge and casting methods, results caused by variables, and finally, differences between materials made by powder metallurge and casting through comparing them in various ways.
2. Experimental procedure
1) Producing the Al-4.5wt.% Cu specimen
① Cut material fine for weighing and putting properly.
② Put material into the crucible and heat. The crucible used for the experiment is treated at less than 800°C.
③ If we maintain solution temperature high, nonmetal-material might have chance to float or sink. then we can get pure melted material. Solution should be treated under 800°C otherwise absorption of hydrogen and loss of oxygen increase at high temperature.
④ Put melted material into mold in a short haul otherwise the turbulent flow will be generated.
⑤ Cut the solid into 4 pieces properly.
목차
1. Object2. Experimental procedure
3. Equipments
4. Experimental theory
5. Prediction results
6. Reference
본문내용
1. ObjectThe purpose of this experiment is understanding the meaning of variables at powder metallurge and casting methods, results caused by variables, and finally, differences between materials made by powder metallurge and casting through comparing them in various ways.
2. Experimental procedure
1) Producing the Al-4.5wt.% Cu specimen
① Cut material fine for weighing and putting properly.
② Put material into the crucible and heat. The crucible used for the experiment is treated at less than 800°C.
③ If we maintain solution temperature high, nonmetal-material might have chance to float or sink. then we can get pure melted material. Solution should be treated under 800°C otherwise absorption of hydrogen and loss of oxygen increase at high temperature.
④ Put melted material into mold in a short haul otherwise the turbulent flow will be generated.
⑤ Cut the solid into 4 pieces properly.
2) Aging hardening
① Use tube furnace in this experiments
3) Electric conductivity
Electric conductivity also increases. Because the grain size increases in proportion to time so the number of grain boundaries which disturb the movement of electrons are reduced.
※ Expected results following other variables(except processing time variable)
1) PM pressure / sintering temperature
Pressure and sinter temperature affect to material`s movement in PM method. The higher forming pressure and sintering temperature, the faster the movement of material, then material`s properties are changed. Generally, hardness is increase, micro structure has more fine formation, and electric conductivity is getting better.
2) Composition of alloy
Copper`s density and electric conductivity is bigger than aluminum, so as the copper`s percentage gets higher, density and electric conductivity gets higher too. But as copper`s ratio rises, the grain size grows
참고 자료
1)Al-Cu계에서 Cu량의 변화에 따른 초소성 거동에 관한 연구 (이종태, 고려대학교, 1987, p.22~30)2)금속강도학(제 3판)(G.E. Dieter, 사이텍미디어, 1997, p.74~208 )
3)시효처리에 따른 알루미늄폼 합금 재료의 미세구조와 기계적 특성 연구 (류관무, 인하대 대학원, 2004, p.1~49)
4)금속강도학 (이동녕, 文運堂, 1980/p 36~50)