TOZ METALURJİSİ YÖNTEMİYLE ÜRETİLMİŞ Ni-Ti-Cu ALAŞIMLARININ DİFÜZYON KAYNAĞINDA (BİNDİRME-KAYMA) SONUÇLARININ YAPAY SİNİR AĞLARI (ANN) İLE BELİRLENMESİ

Yıl 2008, Cilt: 6 Sayı: 2, 75 - 83, 30.03.2008

Haluk Kejanlı , Mustafa Taşkın , Uğur Çalıgülü

Öz

Bu
çalışmada, toz metalurjisi yöntemiyle üretilmiş Ni-Ti-Cu alaşımlarının difüzyon
kaynağı sonrasında yapılan bindirme-kayma (Shear-Strength) test sonuçlarının Yapay Sinir Ağları (Artificial Neural
Network) yöntemi kullanılarak yapılan
eğitme sonrası elde edilen sonuçlarla tutarlılığı araştırılmıştır. Ni-Ti-Cu
kompo-zit malzemelerin kimyasal bileşimi % 49 
Ni - %51  Ti olup, tozlar 45mm boyutundadır. Difüzyon kaynakları, argon atmosferi
altında, 5 MPa sabit basınçta, 940-970 ºC sıcaklıklarda ve 40-60 dk. sürelerde
yapılmıştır. Kaynaklı numuneler birleşme bölgesine dik doğrultuda kesilerek,
numunelerin optik mikroskop, SEM-EDS analizleri yapılmıştır. Numunelerin kaynak
sonrası birleşme kalitesini tespit etmek için bindirme-kayma testleri
yapılmıştır ve elde edilen sonuçlar bilgisayar ortamında Yapay Sinir Ağları
programında test edilmiş-tir. Test programında kaynak sıcaklıkları ve kaynak
süreleri girdi, bindirme-kayma sonuçları da çıktı olarak kullanılmıştır. Gerçek
sonuçlar ile Yapay Sinir Ağları test analizi sonuçları birbirleriyle
karşılaştırılmış, so-nuçlar arasında bir tutarlılığın olduğu bilgisayar ortamında
tespit edilmiştir.

Anahtar Kelimeler

Ni-Ti, Difüzyon Kaynağı, Bindirme-Kayma, Yapay Sinir Ağları

ARTIFICIAL NEURAL NETWORK (ANN) APPROACH THE PREDICTION OF DIFFUSION BONDING BEHAVIOR (SHEAR STRENGTH) OF Ni-Ti-Cu ALLOYS MANUFACTURED BY POWDER METALLURGY METHOD

Öz

In this study, Artificial Neural Network approach to prediction of diffusion
bonding behavior of Ni-Ti-Cu alloys, manufactured by powder metallurgy process,
were obtained using a back-propagation neural network that uses gradient
descent learning algorithm. Ni-Ti-Cu composite was manufactured with a chemical
composition of 49 % Ni - 51 % Ti in weight percent as mixture with an average
dimension of 45mm. Diffusi-on
welding process have been made under argon atmosphere, with a constant load of
5 MPa, under the temperature of 940 and 970 ºC, in 40 and 60 minutes experiment
time. Microstructure examination at bond interface were investigated by optical
microscopy, SEM-EDS. Specimens were tested for shear strength and
metallographic evaluations.  After the
completion of experimental process and relevant test, to prepare the training
and test (checking) set of the network, results were recorded in a file on a
computer. In neural networks training module, different temperatures and
welding periods were used as input, shear strength of bonded specimens at
interface were used as outputs. Then, the neural network was trained using the
prepared training set (also known as learning set). At the end of the training
process, the test data were used to check the system accuracy. As a result the
neural network was found successful in the prediction of diffusion bonding
shear strength and behavior.  

Anahtar Kelimeler

Ni-Ti, Diffusion Bonding, Shear Strength, Artificial Neural Network

Kaynakça

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