Microstructure and mechanical properties of directionally solidified γ/γ-α eutectic composites
by J. Lapin
International Journal of Materials and Product Technology (IJMPT), Vol. 18, No. 1/2/3, 2003

Abstract: The microstructure and mechanical properties of four directionally solidified γ/γ-α eutectic composites with chemical composition Ni-20.1Mo-13.6Al, Ni-20.2Mo-14.1Al-3.5Cr, Ni-20.4Mo-14.7Al-1.8V and Ni-18.4Mo-13.9Al-2.0V-0.5Re (at.%) are characterised. The crystallographic relationships between the coexisting phases, the effect of the growth rate of eutectic composite on the microstructural parameters and experimentally determined critical values for the stability of planar solid-liquid interface are outlined and discussed. An analytical model for prediction of the tensile offset yield stress based on the concept of Orowan stress is proposed. The fracture micromechanisms identified during tensile in-situ straining in SEM and fracture mode are described. High-temperature creep characteristics including stress exponents and activation energies for creep are calculated and compared to those of other intermetallic Ni3Al-based alloys. An analytical model for steady-state creep behaviour is presented. Creep fracture mode and effect of coexisting phases on initiation and crack propagation are discussed.

Online publication date: Wed, 08-Oct-2003

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Materials and Product Technology (IJMPT):
Login with your Inderscience username and password:

    Username:        Password:         

Forgotten your password?


Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com