Microstructures, Mechanical Properties, and Shape Memory Characteristics of Powder Metallurgy Ti51Ni49 Modified with Boron
Resource
Metallurgical and Materials Transactions A, 43(2), 687-696
Journal
Metallurgical and Materials Transactions A
Pages
687-696
Date Issued
2012
Date
2012
Author(s)
Yen, Fu-Cheng
Hwang, Kuen-Shyang
Abstract
Ti 51Ni 49 compacts consolidated with persistent liquid-phase sintering usually contain Ti 2Ni networks at the grain boundaries, which cause adverse effects on mechanical properties. With 0.5 and 1.0 at pct B additions, fine TiB forms during heating and sintering and acts as a nucleation site for Ti 2Ni to precipitate within the grain during cooling. The resultant uniform distribution of TiB and Ti 2Ni impedes grain growth and prevents the formation of continuous Ti 2Ni precipitates at grain boundaries. As a result, a significant increase in tensile elongation, and not a decrease, as in most as-cast titanium alloys, is obtained because of these changes. The tensile strength also increases, without deterioration of the shape memory characteristics. The tensile strength and elongation are close to those of wrought TiNi alloys. © The Minerals, Metals & Materials Society and ASM International 2011.
Ti 51Ni 49 compacts consolidated with persistent liquid-phase sintering usually contain Ti 2Ni networks at the grain boundaries, which cause adverse effects on mechanical properties. With 0.5 and 1.0 at pct B additions, fine TiB forms during heating and sintering and acts as a nucleation site for Ti 2Ni to precipitate within the grain during cooling. The resultant uniform distribution of TiB and Ti 2Ni impedes grain growth and prevents the formation of continuous Ti 2Ni precipitates at grain boundaries. As a result, a significant increase in tensile elongation, and not a decrease, as in most as-cast titanium alloys, is obtained because of these changes. The tensile strength also increases, without deterioration of the shape memory characteristics. The tensile strength and elongation are close to those of wrought TiNi alloys. © The Minerals, Metals & Materials Society and ASM International 2011.
Type
journal article
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