![\"Al\u00fcminyum](\"https:\/\/aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/12\/Degassing-of-Aluminum-Alloy-Casting.jpg\")
<\/p>\n<\/p>\n
Al\u00fcminyum ala\u015f\u0131ml\u0131 d\u00f6k\u00fcmlerin gazdan ar\u0131nd\u0131r\u0131lmas\u0131, y\u00fcksek kaliteli al\u00fcminyum \u00fcr\u00fcnler elde etmek a\u00e7\u0131s\u0131ndan b\u00fcy\u00fck \u00f6nem ta\u015f\u0131maktad\u0131r.<\/p>\n
Al\u00fcminyum ala\u015f\u0131ml\u0131 k\u00fcl\u00e7enin homojenle\u015ftirme \u0131s\u0131l i\u015fleminden sonra, y\u00fczeyde bazen kabarc\u0131klar olu\u015fur. Al\u00fcminyum ala\u015f\u0131ml\u0131 d\u00f6k\u00fcm\u00fcn y\u00fczeyinde da\u011f\u0131n\u0131k \u00e7\u0131k\u0131nt\u0131lar g\u00f6r\u00fcl\u00fcr ve bu \u00e7\u0131k\u0131nt\u0131lar asl\u0131nda bo\u015fluklard\u0131r. B\u00fcy\u00fct\u00fclerek incelendi\u011finde, bo\u015flu\u011fun i\u00e7 duvar\u0131nda parlak metalik bir \u0131\u015f\u0131lt\u0131 g\u00f6zlenir.<\/p>\n
Gev\u015fek ve homojen tavlamadan sonra geriye kalan dendritik yap\u0131, kabarc\u0131k bo\u015flu\u011funun yak\u0131n\u0131nda yer al\u0131r ve kabarc\u0131\u011f\u0131n i\u00e7 duvar\u0131ndaki kar\u015f\u0131l\u0131k gelen konumdaki dendritik yap\u0131 ile bu aras\u0131nda bir ili\u015fki vard\u0131r. Elektron mikroskobuyla incelendi\u011finde, kabarc\u0131klar\u0131n i\u00e7 duvar\u0131nda trapez \u015feklinde bir desen g\u00f6r\u00fcl\u00fcr ve y\u00fczeydeki kabarc\u0131klar gev\u015fektir. D\u00f6k\u00fcmden sonra al\u00fcminyum ala\u015f\u0131ml\u0131 k\u00fcl\u00e7enin y\u00fczeyinde kabarc\u0131k g\u00f6r\u00fclmez; ancak d\u00f6k\u00fcm homojen bir \u015fekilde tavland\u0131ktan sonra ortaya \u00e7\u0131kar. Bu durum metalurjik bir kusur gibi g\u00f6r\u00fcnmemekle birlikte, k\u00fcl\u00e7e d\u00f6k\u00fcm s\u00fcrecindeki y\u00fcksek hidrojen i\u00e7eri\u011finden kaynaklanmaktad\u0131r.<\/p>\n
Al\u00fcminyum ala\u015f\u0131m\u0131n\u0131n eritme i\u015flemi s\u0131ras\u0131nda, gaz gideriminin tam olarak ger\u00e7ekle\u015fmemesi nedeniyle eriyik i\u00e7inde kalan fazla gaz (\u00e7o\u011funlukla hidrojen), al\u00fcminyum k\u00fcl\u00e7esinde birikir. Hidrojen i\u00e7eri\u011fi \u00e7ok y\u00fcksek olursa, al\u00fcminyum k\u00fcl\u00e7esinde kabarc\u0131klar olu\u015fur.<\/p>\n
Su buhar\u0131 ve al\u00fcminyum ala\u015f\u0131m\u0131 y\u00fczeyleri atomik hidrojen \u00fcretir. Hidrojen atomu k\u00fc\u00e7\u00fck bir yar\u0131\u00e7apa sahiptir ve tane s\u0131n\u0131rlar\u0131 ile kristal kafes boyunca metal tabakas\u0131na yay\u0131l\u0131r. F\u0131r\u0131ndaki s\u0131cakl\u0131k d\u00fc\u015f\u00fcr\u00fcld\u00fc\u011f\u00fcnde, f\u0131r\u0131ndaki hidrojen konsantrasyonu \u00e7ok d\u00fc\u015f\u00fck olur ve hidrojen kat\u0131 \u00e7\u00f6zeltiden \u00e7\u00f6kelir. Bas\u0131n\u00e7, atmosfer bas\u0131nc\u0131n\u0131n birka\u00e7 kat\u0131na ula\u015ft\u0131\u011f\u0131nda, y\u00fczeydeki metal \u015fi\u015ferek kabarc\u0131klar olu\u015fturur.<\/p>\n