โครงสร้างและคุณสมบัติของสารประกอบอินเตอร์เมทัลลิกที่ผ่านการแข็ง ตัวอย่างรวดเร็ว

Structure and Properties of Rapidly Solidified Intermetallic Compounds

Name: สุริยา โชคสวัสดิ์

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Name: Suriya Choksavusdi

keyword: สารประกอบอินเตอร์เมทัลลิก

; เมลท์สปินนิง

; Intermetallic Compounds

; Melt spinning

Abstract: This research investigated the structures and properties of the intermetalliccompounds rapidly solidified by melt spinning technique. The compound NiAl wasused as based material and additions of Ti and Ni were made in an attempt toincrease, respectively, the strength and ductility of the compound. As the result, fourtypes of the compounds were studied namely NiAl, NiAl+Ti, Ni,Al+Ti andNi,Al+Ti.Experimental procedures started with preparing the ingots of the materialswith respective compositions. Part of the ingots were then melt spun using a 2TMMelt Spinner at the controlled rotating wheel speed of 500, 1,500 and 2,750 r-pm.Structures and properties of the ingots and ribbons were then examined and analysedusing microhardness tester, optical microscope, SEM, XRD, XRF and EDS.The results showed that, the structure and properties of the compoundschanged with chemical compositions and cooling rates. Microstructures of NiAl andNi,Al+Ti was single phase, consisting of columnar and equiaxed grain.Crystalstructure of NiAl was found to be of type B2-BCC( CsCl > , while that of Ni,Al+Tiwas of y’ - FCC (AuCu,I) type. The hardness values NiAl and Ni3Al+Tiwere 383 HV and 378 HV, respectively. For NiAl+Ti (4.5% Ti) sample, the structureconsisted of equiaxed grain of NiAl, surrounded by the second phase of TiNiAl,having the crystal structure of Cc,- FCC (Cs,,Mg,Si,) type. The grains were very fineand the hardness value of 648 HV was obtained. The structures of Ni,Al+Ti samplewere mostly dendrite, and a small portion eutectic having a crystal structure ofZ,- FCC (MnCu,Al) type for Ni,AlTi and Y’ - FCC (AuCu,I) type for Ni,AlTi.The grain size of ribbons are finer than that of ingots for all the compoundsstudied. The hardness of ribbons were higher than that of ingots in all cases. Thehardness of ribbons consisting of equiaxed grain was higher than the one consistingonly of columnar grains. If the rotating speed of melt spinning copper wheel wasincreased , grain size of grains was finer and hardness was also higher .In conclusion, Ti content which was alloyed in the NiAl compound , led tohigher hardness, whereas the increasing Ni-content could significantly improveductility. Although the cooling rate of the ribbons directly affected the microstructurebut it was not change the crystal structure of all the compounds.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: ผศ.ดร. ปัญญา ศรีจันทร์

Role: อาจารย์ที่ปรึกษา

Created: 2539

Issued: 2005-04-09

Modified: 2006-05-30

วิทยานิพนธ์/Thesis

ISBN: 9746218786

CallNumber: MT27

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: เทคโนโลยีวัสดุ

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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