Abstract
A micro-tensile testing system coupled with focussed ion beam (FIB) machining was used to characterise the micro-mechanical properties of the weld from a turbine disc alloy. The strength variations between the weld and the base alloy are rationalised via the microstructure obtained.
Highlights
The development of micro-scale experiments has been initiated by the need to evaluate the mechanical behaviour of small volumes of materials and by a desire to determine how the mechanical properties of a material change when external dimensions are greatly reduced [1,2,3,4,5]
This paper reports in-situ micro-tensile deformation of IFW RR1000, focussing on the yielding
RR1000 is a recently developed (Rolls Royce) nickel base superalloy processed via powder metallurgy with a nominal chemical composition of 15.0 Cr, 18.5 Co, 5.0 Mo, 3.0 Al, 3.6 Ti, 2.0 Ta, 0.5 Hf, 0.015 B, 0.06 Zr, 0.027 C and balance nickel
Summary
The development of micro-scale experiments has been initiated by the need to evaluate the mechanical behaviour of small volumes of materials and by a desire to determine how the mechanical properties of a material change when external dimensions are greatly reduced [1,2,3,4,5]. Micro-tensile testing has been effectively used to characterise the mechanical properties of thin films, e.g. of MEMS. The methods often used in preparing micro-tensile specimens include material deposition on substrate (additive process) [6,7,8], deep reactive ion etching (subtractive process) [9] and electrodischarge machining [10]. All these methods have been successfully used, but cannot be adopted for applications where a particular site of interest within a large volume of material is needed to be characterised. Focussed ion beam (FIB) is an invaluable tool for fabricating micron-sized structures, due to its ability to deposit Pt or W in controlled shapes, the availability of submicron (20–50 nm) ion beams, 3-D stages, and fully automated control [11].
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