#TITLE_ALTERNATIVE#

• Main Author: RAMONA (NIM : 12507004), RIZKY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24081
• Institution: Institut Teknologi Bandung

Alumunium has vital importance role as required material in several component of airplane. Alumunium type 2014 is mostly used for airplane component among other type of <br /> <br /> <br /> <br /> Alumunium series 2000. Alloying elements in alumunium series 2014 such as Cu, Mn and Si will enhance solid solution potential so there is difference in potential between alloying elements and their matrix (Al) correspond to decreasing of corrosion resistance. To increase the corrosion resistance, this type of alumunium is then coated by using pure alumunium also known as clad. Nevertheless, heat treatment process will encourage dissolved elements in solid solution like Cu to move toward alumunium clad which doesn’t contain dissolved elements, while Al will diffuse toward alumunium alloy 2014, which is known as interdiffusion process. There will be changes of interface microstructure appeareance between clad and alumunium alloy 2014 due to diffusion of Cu into clad layer, correspond to reducing of clad layer thickness and eventually cause uncapability of protecting the alloy <br /> <br /> <br /> <br /> from corrosion. The objectives of this investigation are follows: (1) to recommend limitation of reheat treatment which actually can be done (2) to determine quantitatively reduction of clad layer thickness on each reheat treatment (3) to determine hardness after reheat treatment process, as consequence of diffusion of dissolved elements and (4) to predict the amount of <br /> <br /> <br /> <br /> heat treatment stage(s) that will cause consumption of entire clad. Metaloghrapical test resulted microstructure appeareances together with the thickness of clad layer on several treatments. EDX test has purpose to determine mass percentage and also atomic percentage of each species contained inside the alloy. Hardness test is done to show the effect of mass <br /> <br /> <br /> <br /> percentage of Cu on the clad's hardness after aging. The average of diffusion coefficient for Cu in Al is 1.207 x 10-13 m2/s, diffusion coefficient for Mg in Al is 2.472 x 10-13 m2/s, and diffusion coefficient for Al in Al is 2.492 x 10-13 m2/s. The aging time during 18 hours at <br /> <br /> <br /> <br /> temperature 1600C was still insufficient to encourage the speci to diffuse into clad. Reduction rate of clad thickness was found to be 2.516 &#956;m/hour of that heat treatment. The clad thickness didn't longer follow specifications of heat treatment at 5000C during 11 hour, while clad layer was completed out of heat treatment at 5000C during 27 hour. Reduction of clad <br /> <br /> <br /> <br /> thickness caused reduction of spesi diffusion space so that increasing of mass percentage was faster compared to no reduction of clad thickness. Artificial aging process showed that surface hardness significantly increased after the fourth aging (± 38,55 HVN). This happened on the fifth aging (± 43,20 HVN) because clad thickness on this condition was the smallest (47,35 &#956;m). The hardness will increase as Cu content in alloy increase. 4% mass percentage of Cu resulted hardness in amount of 170 HVN while 0% mass percentage of Cu resulted hardness in amount of 30 HVN.