Speaker
Dr
Alexander Logachev
(JSC"Kompozit")
Description
We have proposed a following approach to determine the parameters of hot isostatic pressing (HIP) intend for consolidation of the powders from intermetallic alloys with a large prone to embrittlement at ambient temperatures. We analyze a temperature dependence of the mechanical properties (0.02 proof stress, σ0.02) and diffusion characteristics (the diffusion coefficients in the bulk and along interfaces) of the alloy and use the following manner to a choice of the HIP parameters (the temperature THIP and the pressure PHIP). If one needs to conserve a small-grained microstructure in the compacted state after HIP, PHIP pressure at a given temperature has to be smaller than σ0.02 and a condition of the large diffusion path of vacancies in the microstructure has to be fulfiled. When a significant coarsening of the microstructure under HIP is acceptable, PHIP pressure has to be larger than σ0.02 without a control of diffusivity.
An ability of HIP to form differend kinds of microstructures is especially important in a case of treating the materials having a large tendency to embrittlement at ambient temperatures. Here we have used such an approach to consolidation of the powders from intermetallic Ni3Al-base alloy and presented the data deal with microstructure and mechanical properties of this alloy.
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Primary author
Dr
Alexander Logachev
(JSC"Kompozit")
Co-authors
Dr
Alexander Beresnev
(JSC"Kompozit")
Prof.
Igor Razumovskii
(JSC"Kompozit" Chief researcher)
