By T. S. Cale, F. S. Pintchovski
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Extra resources for Advanced Metallization for Ulsi Applications
In 1976, Savage et al. 3. The fusion zone was considered to consist of two regions. The composite region represented the portion of the fusion zone where base metal and filler metal were mixed in a “composite” composition. Surrounding this region along the fusion boundary, they defined a region called the unmixed zone (UMZ). The UMZ consists of melted and resolidified base metal that does not mix with the filler metal. In some alloy systems, the UMZ can exhibit microstructures and properties very different from those of the composite region, particularly when dissimilar filler metals are used.
12 Welding Metallurgy Principles The HAZ was subdivided into two regions, the partially melted zone (PMZ) and the “true” heat-affected zone (T-HAZ). The PMZ exists in all fusion welds made in alloys since a transition from 100% liquid to 100% solid must occur across the fusion boundary. In addition, other mechanisms were identified that resulted in local melting (or liquation) in a narrow region surrounding the fusion zone. These include grain boundary melting due to segregation and a phenomenon described as “constitutional liquation” that results from local melting associated with a constituent particle.
1. 2â•… Regions of a Fusion Weld Examination of a welded joint reveals distinct microstructural regions. The fusion zone is associated with melting. The HAZ, though not melted, is affected by the heat from the joining process. Beyond the HAZ is the unaffected base metal. The fusion zone and HAZ can be further subdivided, as described in this section. The fusion zone is described as such because it is the region where melting and solidification occur to form the joint, or weld. Since all metals are crystalline in nature, many possessing cubic crystal lattices, there are general solidification phenomena common to all metals.
Advanced Metallization for Ulsi Applications by T. S. Cale, F. S. Pintchovski