Intermetallic Reaction Zone
The brittle intermediate layer between solder and base material, formed by diffusion of atoms. Its thickness must be limited to avoid embrittlement.
Physical-Chemical Mechanism of Action
The Intermetallic Reaction Zone (IMRZ) forms by the diffusion of atoms between solder and base material. Here, metals exchange their atoms, leading to a new brittle phase.
Metallurgical Relevance & Welding Risks
A too-thick IMRZ can embrittle the workpiece and impair its mechanical properties. This can lead to cracks and low toughness, reducing the component's service life.
Workshop Practice & Action Instructions
To ensure a thin IMRZ, it is important to perform the soldering process under optimal conditions. This includes proper selection of filler metal and soldering temperature, as well as careful cooling after soldering. An IMRZ thickness of less than 10 µm is adequate in most cases.