Burgers vektörü

Sol tarafta kusursuz kristal yapılar görülmektedir. Sağ üstte kenar, sağ altta ise bu yapıların vida dislokasyonu geçirmiş hali yer almaktadır. Kenar dislokasyonunda Burgers vektörü dislokasyon çizgisine dik, vida dislokasyonunda ise paralel yöndedir.

Burgers vektörü, genellikle b sembolüyle gösterilen ve kristal yapılı malzemelerdeki dislokasyonun hangi yönde gerçekleştiğini belirlemeye yarayan vektör. Adını Hollandalı fizikçi Jan Burgers'ten almaktadır.[1]

Vektörün büyüklüğü ve yönü; kristal yapıda dislokasyon yokmuş gibi, yani kusursuzmuş gibi düşünülerek bulunur. Bu kusursuz yapının tüm yönlerinde, aynı büyüklükteki atomik mesafeler (a ile gösterilir) kadar ilerlenir ve tam bir çevrim sağlanır. Aynı çevrim, dislokasyonun olduğu kısımdan geçiyorsa tam olarak kapanmayacaktır. Bağlantıyı kapatan b uzunluğundaki vektöre Burgers vektörü denir. Burgers vektörü; kenar dislokasyonlarında dislokasyon çizgisine dik, vida dislokasyonlarında ise dislokasyon çizgisine paraleldir.[2]

Kaynakça

  1. ^ Callister, William D. Jr. (2005). Fundamentals of Materials Science and Engineering. Danvers, Massachusetts: John Wiley & Sons. 
  2. ^ Onaran, Kâşif (2006). Malzeme Bilimi. Bilim Teknik Yayınevi. s. 47. ISBN 975-540-017-6. 

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