FE-CU İKİLİ ALAŞIMLARININ KUTU BORLAMA DAVRANIŞINA BAKIR MİKTARININ ETKİSİ

Sezgin CENGİZ, Yücel GENÇER, Mehmet TARAKÇI, Yunus AZAKLI
1.648 852

Öz


İçerisine atomik olarak % 1, 2, 4, 8 ve 16 bakır katkılandırılarak hazırlanan Fe-Cu ikili alaşımları ve saf demir 1000°C’ de 3 saat süre ile kutu borlama işlemine tabi tutulmuştur. Elde edilen borür tabakanın faz içeriği, mikroyapısı, kimyasal kompozisyonu ve mikrosertliği, X-ışınları kırınımı, Yüzey Taramalı Elektron Mikroskobunda Enerji Dağılımlı X-ışınları Spektroskopisi (SEM-EDS) ve Vickers Mikrosertlik ölçümü ile karakterize edilmiştir. Altlıktaki Cu miktarının artmasıyla borür tabakasının morfolojisini değiştirdiği ve altlığa doğru taraksı bir yapıda büyüyen borür dişlerin incelerek daha da uzadığı tespit edilmiştir.  Bakır atomları, ne CuxBy bileşiği oluşturmuş ne de oluşan demir borür tabakası içerisinde çözünmüştür. Ancak, borür dişlerinin büyüme yönüne paralel şekilde kümeleşerek bakırca zengin çökeltiler oluşturmuştur.  Bu çökeltiler altlıktaki bakır miktarının artmasıyla hem kabalaşmış hem de miktarı artmıştır. Altlıktaki bakır miktarındaki artışa bağlı olarak borca zengin FeB fazının oluşumu desteklenmiş ve toplam borür tabaka kalınlığı artmış, ancak borür tabakanın sertliği düşmüştür.

Anahtar kelimeler


Kutu borlama, FeB, Fe2B, Fe-Cu alaşımı, Borür tabaka morfolojisi

Tam metin:

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DOI: http://dx.doi.org/10.17341/gummfd.92619

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