![\"7000](\"https:\/\/aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/11\/Impurities-in-7000-Series.jpg\")
<\/p>\n7000 serisi Al-Zn-Mg ve Al-Zn-Mg-Cu ala\u015f\u0131mlar\u0131ndaki ba\u015fl\u0131ca safs\u0131zl\u0131klar Fe ve Si\u2019dir. Fe, \u00f6zellikle Mn i\u00e7eri\u011fi y\u00fcksek ala\u015f\u0131mlarda, ala\u015f\u0131m\u0131n korozyon direncini ve mekanik \u00f6zelliklerini d\u00fc\u015f\u00fcr\u00fcr. Bu nedenle, Fe i\u00e7eri\u011fi m\u00fcmk\u00fcn oldu\u011funca d\u00fc\u015f\u00fck olmal\u0131 ve i\u00e7eri\u011fi 0,3%'nin alt\u0131nda tutulmal\u0131d\u0131r. Si, ala\u015f\u0131m\u0131n mukavemetini d\u00fc\u015f\u00fcrebilir, b\u00fck\u00fclme performans\u0131n\u0131 hafif\u00e7e azaltabilir ve kaynak \u00e7atlaklar\u0131 olu\u015fma e\u011filimini art\u0131rabilir. Si i\u00e7eri\u011fi 0,3%'nin alt\u0131nda tutulmal\u0131d\u0131r.<\/p>\n
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7000 Serisi\u2019ndeki bu safs\u0131zl\u0131klar, esas olarak sert ve k\u0131r\u0131lgan FeAl\u2083 ve serbest Si \u015feklinde bulunur. Bu safs\u0131zl\u0131klar ayr\u0131ca (FeMn)Al6, (FeMn)Si2Al3, Al (FeMnCr) ve Mn ile Cr i\u00e7eren di\u011fer iri bile\u015fikleri olu\u015fturur. FeAl3, taneleri inceltici etkiye sahiptir; ancak korozyon direnci \u00fczerinde daha b\u00fcy\u00fck bir etkiye sahiptir. \u00c7\u00f6z\u00fcnmeyen faz\u0131n i\u00e7eri\u011fi artt\u0131k\u00e7a, \u00e7\u00f6z\u00fcnmeyen faz\u0131n hacim fraksiyonu da artar. Bu \u00e7\u00f6z\u00fcnmeyen ikinci fazlar, deformasyon s\u0131ras\u0131nda k\u0131r\u0131lacak ve uzayacak ve \u015ferit benzeri bir yap\u0131 ortaya \u00e7\u0131kacakt\u0131r. Par\u00e7ac\u0131klar, deformasyon y\u00f6n\u00fc boyunca d\u00fcz bir \u00e7izgi halinde d\u00fczenlenir. Ayr\u0131k \u00e7ubuklar\u0131n bile\u015fimi. Safs\u0131zl\u0131k par\u00e7ac\u0131klar\u0131 tanelerin i\u00e7inde veya tane s\u0131n\u0131rlar\u0131nda da\u011f\u0131ld\u0131\u011f\u0131ndan, plastik deformasyon s\u0131ras\u0131nda tane-matris s\u0131n\u0131r\u0131n\u0131n bir k\u0131sm\u0131nda g\u00f6zenekler olu\u015fur; bu da mikro \u00e7atlaklara yol a\u00e7ar ve bunlar makroskobik \u00e7atlaklar\u0131n olu\u015fma noktas\u0131 haline gelir; ayr\u0131ca \u00e7atlaklar\u0131n erken geli\u015fmesini de te\u015fvik eder.<\/p>\n
Buna ek olarak, yorulma \u00e7atlaklar\u0131n\u0131n b\u00fcy\u00fcme h\u0131z\u0131 \u00fczerinde daha b\u00fcy\u00fck bir etkiye sahiptir. K\u0131r\u0131lma s\u0131ras\u0131nda yerel plastisiteyi azalt\u0131c\u0131 belirli bir etkisi vard\u0131r. Bu durum, kirlilik say\u0131s\u0131ndaki art\u0131\u015f ve par\u00e7ac\u0131klar aras\u0131ndaki mesafenin k\u0131salmas\u0131 nedeniyle \u00e7atlak ucu \u00e7evresindeki plastik deformasyon ak\u0131\u015fkanl\u0131\u011f\u0131n\u0131n azalmas\u0131na ba\u011fl\u0131 olabilir. Fe ve Si i\u00e7eren fazlar oda s\u0131cakl\u0131\u011f\u0131nda \u00e7\u00f6z\u00fcnmesi zor oldu\u011fundan, \u00e7entik g\u00f6revi g\u00f6r\u00fcrler ve malzemenin k\u0131r\u0131lmas\u0131na neden olacak \u00e7atlak kaynaklar\u0131 haline gelme olas\u0131l\u0131klar\u0131 y\u00fcksektir; bu da uzama ve \u00f6zellikle ala\u015f\u0131m\u0131n k\u0131r\u0131lma toklu\u011fu \u00fczerinde \u00e7ok olumsuz bir etkiye sahiptir. Bu nedenle, yeni ala\u015f\u0131m\u0131n tasar\u0131m\u0131 ve \u00fcretiminde Fe ve Si i\u00e7eri\u011fi s\u0131k\u0131 bir \u015fekilde kontrol edilmektedir. Y\u00fcksek safl\u0131kta metal hammaddelerin kullan\u0131lmas\u0131n\u0131n yan\u0131 s\u0131ra, bu iki elementin ala\u015f\u0131ma kar\u0131\u015fmas\u0131n\u0131 \u00f6nlemek i\u00e7in eritme ve d\u00f6k\u00fcm s\u00fcre\u00e7leri s\u0131ras\u0131nda da baz\u0131 \u00f6nlemler al\u0131nm\u0131\u015ft\u0131r.<\/p>\n