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Effect of boron additions on microst...

The Ohio State University.

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Effect of boron additions on microstructure and mechanical properties of titanium alloys produced by the Armstrong process.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effect of boron additions on microstructure and mechanical properties of titanium alloys produced by the Armstrong process./
作者:	Blank, Jonathan P.
面頁冊數:	249 p.
附註:	Adviser: James C. Williams.
Contained By:	Dissertation Abstracts International68-12B.
標題:	Textile Technology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292730
ISBN:	9780549361220

Effect of boron additions on microstructure and mechanical properties of titanium alloys produced by the Armstrong process.
Blank, Jonathan P.

Effect of boron additions on microstructure and mechanical properties of titanium alloys produced by the Armstrong process. - 249 p.

Adviser: James C. Williams.

Thesis (Ph.D.)--The Ohio State University, 2008.

The beneficial influence of boron additions on processing, microstructure, physical and mechanical properties of various titanium alloys has been recognized since 1950's. However, boron additions to titanium alloys to obtain specific microstructures and mechanical properties for several niche applications, including automotive and aerospace, have been actively studied during the past 25 years. The addition of boron concentrations greater than 0.05 wt.% to titanium alloys creates a dispersion of TiB. The presence of TiB enhances the tensile and fatigue strengths as well as the wear resistance as compared to the original titanium alloy. Although these improvements in mechanical properties are attractive, there are still two major obstacles in using these alloys: (1) relationship of microstructure and mechanical properties in Ti-B alloys needs further investigation to optimize the alloys for specific commercial applications; and (2) cost to benefit ratio of producing these alloys is high for a given application(s).

ISBN: 9780549361220Subjects--Topical Terms:

1020710
Textile Technology.

Effect of boron additions on microstructure and mechanical properties of titanium alloys produced by the Armstrong process.
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245 1 0 $a Effect of boron additions on microstructure and mechanical properties of titanium alloys produced by the Armstrong process.
300 $a 249 p.
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500 $a Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8379.
502 $a Thesis (Ph.D.)--The Ohio State University, 2008.
520 $a The beneficial influence of boron additions on processing, microstructure, physical and mechanical properties of various titanium alloys has been recognized since 1950's. However, boron additions to titanium alloys to obtain specific microstructures and mechanical properties for several niche applications, including automotive and aerospace, have been actively studied during the past 25 years. The addition of boron concentrations greater than 0.05 wt.% to titanium alloys creates a dispersion of TiB. The presence of TiB enhances the tensile and fatigue strengths as well as the wear resistance as compared to the original titanium alloy. Although these improvements in mechanical properties are attractive, there are still two major obstacles in using these alloys: (1) relationship of microstructure and mechanical properties in Ti-B alloys needs further investigation to optimize the alloys for specific commercial applications; and (2) cost to benefit ratio of producing these alloys is high for a given application(s).
520 $a The Armstrong process is a novel process that can produce commercially pure (CP) titanium and titanium alloy powder directly from TiCl4 (and other metal halides or as required, to obtain the desired alloy composition). The Armstrong process uses sodium as a reducing agent, with similar reactions as the Hunter process using sodium as a reducing agent and Kroll process using magnesium as a reducing agent. The Armstrong process forms CP-Ti and titanium alloyed powder, which can be directly consolidated or melted into the final product. In comparing the downstream processing steps required by the Kroll and Hunter processes with direct consolidation of Armstrong powder, several processing features or steps are eliminated: (1) restriction of batch processing of material, (2) blending of titanium sponge and master alloy material to create titanium alloys, (3) crushing of the sponge product, (4) melting, and (5) several handling steps.
520 $a The main objective of this research was to characterize structure and properties of CP-Ti and Ti-B alloys produced by the Armstrong process. Particular emphasis has been placed on improved understanding of the strengthening mechanisms associated with the addition of boron to titanium alloys.
520 $a The microstructure and mechanical properties were examined for commercially pure (CP) titanium, Ti-0.8wt.%B and Ti-0.9wt.%B alloy powders produced using the Armstrong process. In order to understand the effects of the boron additions on a range of properties, tensile, notched fatigue, fatigue crack growth and compression testing was performed on the consolidated and heat-treated material made from Armstrong powder. These results were interpreted in the light of microstructural and fractographic characterization also performed during the study.
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790 $a 0168
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791 $a Ph.D.
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