This research was conducted to determine the effect of the addition of Titanium (Ti) and the sintering temperature variation on MMC Cu-C alloys as reinforcing elements. The process of this research uses powder metallurgical method with an alloying technique in Mechanical Alloying using a Planetary Ball Mill (PBM) machine with a speed of 600 rpm for 2 hours, the ratio of powder to ball mill is 10: 1. The compacting process is carried out using dies 11 mm in diameter and compacting pressure of 90 Kg/cm2. The sintering process is carried out 3 times, with variations in sintering of 800oC, 900oC, and 1000oC with sintering time for 1 hour in the tube furnace in the argon gas vacuum environment. The number of samples used in this study amounted to 9 samples with variations in alloy and temperature sintering, consist of MMC Cu-C alloy with dopping of  Ti 0%, 0,5%, 1,5% (T=800 oC), MMC Cu-C with  dopping of Ti 0%, 0,5%, 1,5% (T=900 oC), and MMC Cu-C with dopping of Ti 0%, 0,5%, 1,5% (T=1000 oC). The tests included Vickers hardness testing, metallography testing, XRD testing, and SEM-EDS testing. The addition of Ti elements and varying sintering temperature had an effect on the hardness value of MMC Cu-C material with the highest hardness value in samples with 1.5% Ti alloy (800oC) which is 87.25 HV, and and the lowest porosity value is 2.491% in sample of 1.5% Ti (1000oC).

The purpose of this study is to make a compatible material for the application at high temperatures. Material that commonly used is superalloy but this material has low melting point. One material that can replace superalloy material for the application at high temperatures are intermetallic alloys and this alloys are very compatible to facing up Industrial Revolution 4.0. The intermetallic alloys have several characteristics such as high strength at high temperatures, high oxidation resistance, high melting points and low densities. The specimens are made at this research are intermetallic alloys of Fe-18Al-15Cr with variations in the addition of ZrO2 nanoparticles (1%, 3% and 5%). The process of making specimens using one method of powder metallurgy. The process is Mechanical Alloying (MA) which aims to reduce the particle size, increase homogeneity and help to form new phases. In the high temperature oxidation process using a variable temperature at 800°C, 900°C and 1000°C for 4 hours. The result of metallographic testing showed the formation of the intermetallic phase Fe3Al. The result of XRD testing showed the formation of oxide compounds on the surface of the specimen that are Cr2O3, Al2O3 and Fe2O3. Addition of small amount of ZrO2 into the Fe-Al alloy is very effective to enhance the oxidation resistance and hardness of the material.

Penelitian ini untuk mempelajari  pengaruh doping unsur Nb terhadap paduan bioinert Ti-6Al-4V dengan metode elektrokimia sebagai bahan  implant dalam media minuman berkarbonasi. Tujuan penelitian adalah untuk mempebaiki biokompatibel paduan Ti-6Al-4V yang telah di doping dengan Nb dalam media minuman berkabonasi. Pembuatan paduan Ti-6Al-4V-xNb (x= 0, 1 dan 2 %wt) dilakukan dengan melebur Ti-6Al-4V  dan Nb dalam tungku busur listrik. Perilaku elektrokimia paduan Ti-6Al-4V yang telah di doping dengan  unsur Nb di uji menggunakan potensiostat  dengan metode polarisasi Tafel dengan waktu perendaman selama 0 menit, 60 menit, dan 120 didalam media minuman berkarbonasi pada temperatur kamar. Hasil data pengujian polarisasi Tafel diolah dengan software Echem Analist V.5.66 sehingga didapatkan besaran laju korosi paduan Ti-6Al-4V dalam media minuman berkarnonasi. Permukaan paduan  hasil pengujian polarisasi Tafel dievaluasi dengan difraksi sinar X. Dari hasil penelitian yang telah dilakukan menunjukan bahwa paduan Ti-6Al-4V-xNb (x= 0, 1 dan 2 %wt) akan meningkat biokompatibelnya dengan meningkatnya ketahanan korosi dalam media minuman berkabornasi bila paduan titanium yang di doping dengan Nb dengan jumlah yang lebih besar. Hal tersebut terjadi dikarenakan penambahan Nb pada paduan titanium Ti-6Al-4V terjadi peningkatan transisi dari aktif menjadi pasif. Hasil evaluasi sampel  menggunakan difraksi sinar X menujukkan bahwa pada permukaan sampel terdapat lapisan pasif. Dari data di atas dapat disimpulkan bahwa biokompatibel paduan Ti-6Al-4V dalam minuman berkabonasi yang telah di doping dengan Nb unjuk kerjanya akan meningkat.