In the surface alloying layer, the Mg-Al intermetallic compounds
microhardness value was up to 330 HV, the microhardness value of the area near the Mg-Al intermetallic compounds
was about 116 HV and the values of microhardness decreased with the depth increasing from surface coating to the substrate.
It was obvious the detonation velocity used was 29 to 35 % higher than recommended and the occurrence of intermetallic compounds
could have been predicted.
To elucidate the kinetics of intermetallic compound
formation for the immersion tin layers, a systematic characterization of the annealing process was performed.
Their intermetallic compound
composition and morphology were investigated by SEM/EDX, and the crystallographic features of IMC determined by XRD.
TLPS processes rely on the combination of low-temperature melting alloy powders combined with higher-melting metal powders, which, when processed above the melting point of the lower temperature alloy, fuse to form a new intermetallic compound
that will not re-melt at that same temperature but rather a much higher temperature.
Current accepted levels of process strain were established when the dominant and limiting failure mode was interfacial fracture (IFF) in complex intermetallic compound
(IMC) layers at the solder/package interface.
The ball pull investigation indicated that the majority of the balls showed more than 25% of the intermetallic compound
(IMC) at the fracture interface.
The intermetallic compound
dissolves quickly in molten tin, and as a result of these sequential dissolution processes, the underlying copper can quickly be eroded.
Contract notice: Purchase and installation of a molecular beam epitaxy system and a system for in-situ spectroscopy, band mapping and analysis of thin intermetallic compounds
Furthermore, silicon interacts with aluminum and iron--which is invariably present in commercial aluminum casting alloys--to form harmful intermetallic compounds
, such as the (3-(AlsSiFe) phase, which adversely impacts the alloys' ductility, or with precipitation strengthening elements.
Chemical composition of steel can be modified adding some alloying elements such as Cr, Ni, Mn, Si, W and others, which form hard carbides or joint intermetallic compounds
required for precipitation hardening .
Ideally, the interdiffusion among the elements forms all the intermetallic compounds
and solid-solution phases in that multi-component system, creating complete libraries of the single-phase compositions.