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Prediction Of Tensile Mechanical Properties Of Tin-Bismuth Alloys By Vickers Hardness Test

Oluşturulma Tarihi: 10-08-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): İmalat,

Yazar(lar): Alkilani, Nuri Aburodess Alssid (Yazar),

Emeği Geçen(ler): Şengönül, Cemal Merih (Danışman),

Anahtar Kelimeler

Vickers hardness, tensile strength, strain hardening exponent, Tin,Bismuth, SnBi alloy


Özet

Mechanical properties under tensile are the most fundamentally used ones to predictthe mechanical behavior of materials. However, the tensile test can be a cumbersomemethod concerning its bulky equipment, detailed sample preparation protocols andconsiderably high cost. Since there is a strong relation between hardness and tensilestrength of the materials, there are some research studies aimed to establish acorrelation between the tensile properties and hardness values of a material. In fact,hardness measurement is mostly a trivial process which can be performed withoutcomplicated protocols to get information about a material in an apparently cheap andfast way by using small-scale benchtop instruments. In this research work, we adoptedsimilar approach to attain an analytical relationship between mechanical properties liketensile strength, yield strength, strain hardening exponent and strength coefficient of alow melting point alloy system, tin-bismuth (Sn-Bi) and their Vickers hardnessnumbers. This thesis covers a comparative analysis of data from hardness and tensiletests to develop a mathematical relationship that will predict the stress-strain behaviorof these alloys, particularly eutectic. Hence four different compositions of the Sn-Bialloys are used with Bi percentages such as 30%, 40%, 50% and 57% in this work.Tensile tests were performed at room temperature and their plastic regions up to UTSwere analyzed to determine the aforementioned mechanical properties of the givenivalloy compositions. Concurrently hardness measurements were performed to obtaintheir Vickers hardness numbers. As a result, we determine a strong relationshipbetween the tensile mechanical properties and the hardness of the Sn-Bi alloy and theestablished numeric model predicted most of the mechanical properties with a highstatistical significance.




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