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Zeng, Liang.

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Processing and characterization of phase boundaries in ceramic and metallic materials.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Processing and characterization of phase boundaries in ceramic and metallic materials./
Author:	Zeng, Liang.
Description:	268 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3998.
Contained By:	Dissertation Abstracts International64-08B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3100523

Processing and characterization of phase boundaries in ceramic and metallic materials.
Zeng, Liang.

Processing and characterization of phase boundaries in ceramic and metallic materials. - 268 p.

Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3998.

Thesis (Ph.D.)--Michigan State University, 2003.

The goal of this dissertation work was to explore and describe advanced characterization of novel materials processing. These characterizations were carried out using scanning and transmission electron microscopy (SEM and TEM), and X-ray diffraction techniques. The materials studied included ceramics and metallic materials.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Processing and characterization of phase boundaries in ceramic and metallic materials.
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035 $a (UnM)AAI3100523
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100 1 $a Zeng, Liang. $3 1949521
245 1 0 $a Processing and characterization of phase boundaries in ceramic and metallic materials.
300 $a 268 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-08, Section: B, page: 3998.
500 $a Advisers: Martin A. Crimp; Thomas R. Bieler.
502 $a Thesis (Ph.D.)--Michigan State University, 2003.
520 $a The goal of this dissertation work was to explore and describe advanced characterization of novel materials processing. These characterizations were carried out using scanning and transmission electron microscopy (SEM and TEM), and X-ray diffraction techniques. The materials studied included ceramics and metallic materials.
520 $a The first part of this dissertation focuses on the processing, and the resulting interfacial microstructure of ceramics joined using spin-on interlayers. SEM, TEM, and indentation tests were used to investigate the interfacial microstructural and mechanical property evolution of polycrystalline zirconia bonded to glass ceramic MaCor(TM), and polycrystalline alumina to single crystal alumina. Interlayer assisted specimens were joined using a thin amorphous silica interlayer. This interlayer was produced by spin coating an organic based silica bond material precursor and curing at 200°C, followed by joining in a microwave cavity or conventional electric furnace. Experimental results indicate that in the joining of the zirconia and MaCor(TM) no significant interfacial microstructural and mechanical property differences developed between materials joined either with or without interlayers, due to the glassy nature of MaCor(TM). The bond interface was non-planar, as a result of the strong wetting of MaCor(TM) and silica and dissolution of the zirconia. However, without the aid of a silica interlayer, sapphire and 98% polycrystalline alumina failed to join under the experimental conditions under this study. A variety of interfacial morphologies have been observed, including amorphous regions, fine crystalline alumina, and intimate contact between the sapphire and polycrystalline alumina. In addition, the evolution of the joining process from the initial sputter-cure to the final joining state and joining mechanisms were characterized.
520 $a The second part of this dissertation focused on the effects of working and heat treatment on microstructure, texture, phase boundary movement, and mechanical property evolution in Ti-6Al-4V wire. The as-received wire consisted of equilibrium a and metastable beta phases and had a moderately strong fiber texture with prism plane normals aligned with the wire axis. The wire was worked by extrusion, solution heat-treatment and water quenching, and aging. The extrusion process strengthened the as-received texture. After solutionization and quenching, microstrucual observations showed the presence of many needlelike martensitic platelets in the prior beta phase regions. Texture analysis revealed that a secondary fiber with basal plane normals aligned with the wire axis emerged at the expense of the initial texture, indicating that highly preferred phase boundary motion (variant selection) occurred during the beta → alpha transformation. The strength of the variant selection consistently increased with solutionization temperature and time. In addition, the effects of dislocation type and density on variant selections were further investigated. This implies that strategic prior deformation and heat treatment can be exploited to design the resulting texture and microstructure and consequently optimize the properties of titanium products.
590 $a School code: 0128.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Metallurgy. $3 1023648
650 4 $a Engineering, Aerospace. $3 1018395
690 $a 0794
690 $a 0743
690 $a 0538
710 2 0 $a Michigan State University. $3 676168
773 0 $t Dissertation Abstracts International $g 64-08B.
790 1 0 $a Crimp, Martin A., $e advisor
790 1 0 $a Bieler, Thomas R., $e advisor
790 $a 0128
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3100523