Materials Science and Metallurgy Course A: Metals & Alloys

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Materials Science and Metallurgy Course A: Metals & Alloys
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Presentation transcript:

Materials Science and Metallurgy Course A: Metals & Alloys Part IB Materials Science and Metallurgy Course A: Metals & Alloys Professor Harry Bhadeshia Lecture 12: High Temperature Alloys

P122 P23 F. Masuyama

Superheater Outlet Header for 30MPa and 630℃ F. Masuyama

0.5 µm

matrix

Coarsening diffusion r r flux concentration q a q aq c r aq c r 1 2 flux q a q concentration aq c r 1 aq c r 2 distance

To minimise coarsening: Reduce interfacial energy Reduce diffusivity Precipitates with low solubility in matrix

g  ‘

superdislocation

Order hardening Dislocations finding it difficult to penetrate ’ Yanhui Zhang

Superdislocations Hillier, 1984

Page 77

TiAl 

Ti3Al 

Ti-48Al at% Alternating layers of 2 and  Kim, Maruyama, 2001

TiAl  Daido Steel

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