TY  - JOUR
T1  - Stronsiyum ve stronsiyum-magnezyum katkılarının ötektiküstü Al-17Si alaşımının içyapı ve mekanik özelliklerine etkisi
TT  - Effect of strontium and strontium-magnesium additions on the microstructure and mechanical properties of hypereutectic Al-17Si alloy
AU  - Hekimoğlu, Ali Paşa
AU  - Ayata, Gizem
PY  - 2019
DA  - February
JF  - Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi
PB  - Pamukkale Üniversitesi
WT  - DergiPark
SN  - 2147-5881
SP  - 49
EP  - 55
VL  - 25
IS  - 1
LA  - tr
AB  - Al-17Si,Al-17Si-0,1Sr ve Al-17Si-0,1Sr-0,6Mg alaşımları kokil kalıba döküm yöntemi ileüretilmiştir. Alaşımların yapısal ve mekanik özellikleri üretilen alaşım külçelerindentalaşlı imalat yöntemiyle hazırlanan numuneler üzerinde yapılan incelemeler ilebelirlenmiştir. İçyapı incelemeleri standart metalografik yöntemler ilehazırlanan ancak dağlama yapılmayan numuneler üzerinde gerçekleştirilmiştir. İncelenenalaşımların sertlik değerleri Brinell sertlik ölçüm yöntemi, mekanik özelikleriise üniversal bir çekme deneyi makinesinde yapılan testler yardımıyla belirlenmiştir.İkili Al-17Si alaşımının içyapısının alüminyumca zengin α dendiritleri, primersilisyum, ötektik Al-Si ve β fazlarından oluştuğu, üçlü Al-17Si-0.1Sralaşımının içyapısının ise ikili Al-17Si alaşımındaki fazlara ek olarak AlxSiySrzfazını içerdiği görülmüştür. Üçlü Al-17Si-0.1Sr alaşımına %0.6 oranında yapılanmagnezyum katkısının ise bu alaşımın içyapısında Mg2Si fazınınoluşmasına yol açtığı gözlenmiştir. Al-17Si alaşımının sertlik, akma dayanımı,çekme dayanımı ve kopma uzaması değerleri sırasıyla 57 BSD, 93.7 MPa, 127.6 MPa ve %2.4, olarak ölçülmüştür. Bu değerlerAl-17Si-0,1Sr alaşımında 55 BSD, 95.2 MPa, 137.9 MPa ve %2.9, Al-17Si-0.1Sr-0.6Mg alaşımında ise sırasıyla 70 BSD, 123.2 MPa, 141.1 MPa ve %1.1olarak ölçülmüştür. Stronsiyum katkısının ikili Al-17Si alaşımının sertliğiniçok az da olsa düşürdüğü, akma ve çekme dayanımı ile kopma uzaması değerleriniise iyileştirdiği görülmüştür. Magnezyum katkısının ise üçlü Al-17Si-0.1Sralaşımının akma ve çekme mukavemetini önemli ölçüde artırdığı ancak, kopmauzamasını azalttığı belirlenmiştir. Stronsiyum ve stronsiyum-magnezyumkatkılarının Al-17Si alaşımının mekanik özelliklerine etkisi alaşımlarınyapısal özelliklerine dayandırılarak açıklanmıştır.
KW  - Al-17Si esaslı alaşımlar
KW  - İçyapı
KW  - Mekanik özellikler
N2  - Al-17Si, Al-17Si-0,1Sr and Al-17Si-0.1Sr-0,6Mg alloys were produced bypermanent mold casting method. The structural and mechanical properties of thealloys were determined by the investigations carried out on specimens preparedby machining of the produced alloy ingots. The microstructural examinationswere carried out on specimens prepared by standard metallographic methods butwithout etching. Their hardness and mechanical properties ​​were determined byBrinell hardness measurement method and universal tensile tests, respectively.The microstructure of the binary Al-17Si alloy consisted of aluminum-rich α dendrites, primary silicon, eutectic Al-Si and βphases. TernaryAl-17Si-0.1Sr alloy contained AlxSiySrz phasein addition to phases in the binary Al-17Si alloy. It was observed that the0.6% magnesium addition to the ternary Al-17Si-0.1Sr alloy cause to form of Mg2Siphase in the microstructure of this alloy. The values of the hardness, yieldstrength, tensile strength and elongation to fracture of Al-17Si alloy weremeasured as 57 BSD, 93.7 MPa, 127.6 MPa and 2.4%, respectively. These valueswere measured as 55 BSD, 95.2 MPa, 137.9 MPa and 2.9% in Al-17Si-0.1Sr alloy and 70 BSD, 123.2 MPa, 141.1 MPa and1.1% in Al-17Si-0.1Sr-0.6Mg alloy. The addition of strontium reduced thehardness of the binary Al-7Si alloy to a lesser degree but improved the yieldand tensile strength and elongation to fracture values. Magnesium additionsignificantly increased the yield and tensile strength of the ternaryAl-17Si-0.1Sr alloy but decreased their elongation to fracture. The effects ofstrontium and strontium-magnesium additions on the mechanical properties of theAl-17Si alloy were discussed in terms of their structural properties. 
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UR  - http://dergipark.org.tr/tr/pub/pajes/issue//532131
L1  - http://dergipark.org.tr/tr/download/article-file/657383
ER  -