04075ntm a2200385 i 4500952014100000952012400141999001700265003000800282005001700290006001900307008004100326020003200367040002300399090002900422100004400451245015800495264003400653264001200687300007100699336002100770336002100791337002500812337002300837338002300860338003000883347002400913500006400937502007001001504004001071520242701111610007903538650004503617650001103662942001603673  00102lcc40708REFa20000b20000cREFd2022-01-24l0oFTKMA .F34 2021 r ThesispT000001709r2022-05-09 00:00:00t1w2022-01-24yTHESIS  00102lcc40708REFa20000b20000cREFd2022-03-15l0oCD13022pT000001710r2022-07-04 00:00:00t1w2022-03-15yTHESIS  c96538d96544MY-KuUP20251125110001.0t||||fr|||| 000 0 220315s2021    my a|||frm||| 000 0 eng d  aTHE0009158(Local)qhardback  aUMPbengcUMPerda  aFTKMA .F34 2021 r Thesis1 aMuhammad Faez Mohamad Tajudin,eauthor.14aThe effect of processing parameters on microstructure and mechanical properties of aluminium 6061 semisolid metal billet /cMuhammad Faez Mohamad Tajudin 1aKuantan, Pahang :bUMP,c2021 4c© 2021  axiv, 105 pages :billustrations (some color) ;c30 cm. +e1 CD ROM  atext2rdacontent  atext2rdacontent  aunmediated2rdamedia  acomputer2rdamedia  avolume2rdacarrier  acomputer disc2rdacarrier  atext filebPDF2rda  aFaculty of Mechanical and Automotive Engineering Technology  aThesis (Master of Science) -- Universiti Malaysia Pahang – 2021  aIncludes bibliographical references3 aThis thesis presents the experimental works on the effects of the semisolid metal (SSM)  processing parameters on the aluminium feedstock billets produced by the direct thermal  method (DTM). The combinations of pouring temperatures were fixed at 640 °C, 660 °C, and 680 °C with holding times of 20 s, 40 s, and 60 s, respectively. Three samples were  produced for each of the combinations. The SSM feedstock billets were prepared by using  DTM, in which 6061 molten metal was poured into a cylindrical copper mould with a  different combination of pouring temperature and holding time before being solidified  into  room temperature water.  The porosity content, ultimate tensile st1rength,  and  Vickers hardness were examined for the feedstock billets after the DTM process. There  were differences in density value for each sample which occurred between 2.527 g/cm3 and 2.701 g/cm3. Sample 6 with a pouring temperature of 660 °C and holding time of 60  s has the highest density value, which was 2.701 g/cm3. This indicated that sample 6 has  the lowest porosity content within the feedstock billets. The tensile test results showed that the ultimate tensile test values were between 65.39 MPa and 146.797 MPa, while the  Vickers hardness test values were between 65.85 HV and 86.5 HV. In the sample with  pouring temperature slightly above the  aluminium 6061 liquidus temperature, the  porosity content had decreased; tensile strength and hardness values had increased. Sample 4 with a pouring temperature of 660 °C and holding time of 20 s produced  globular and small grain size for the primary phase area, which was 2547.87 µm2. Results  show that, due to the rapid cooling condition of the molten 6061 inside the copper mould,  more globular microstructures were obtained. The faster the heat is convicted out from  the molten alloy will retard the formation of dendritic microstructure, thus transforming it into globular microstructure for SSM processing. The lower pouring temperature  enhances the formation of nucleation during the solidification process, thus producing more globular microstructure and smaller grain size. The findings of this experimental  works enhance a better understanding of the behaviour of aluminium alloy 6061 SSM  feedstock billets. These findings could lead to better information on the formability  behaviour of aluminium alloy 6061, mainly in the manufacturing industry.20aFaculty of Mechanical and Automotive Engineering TechnologyxDissertations 0aUniversities and collegesxDissertations 0aTheses  2lcccTHESIS