It has 9 % allotriomorphic
ferrite (the white features outlining prior austenite grain boundaries), with some Widmanstatten side plates also along prior austenite boundaries, and the remainder appears to be acicular ferrite.
Figure 6 presents schematically the formation of the Zn-rich [beta] phase (allotriomorphic
phase) in the (Al)/(Al) GB with the corresponding dihedral [theta] angle indicated.
The granite displays medium-grained, hypidiomorphic to, less commonly, allotriomorphic
, subequigranular to equigranular, and sparingly granophyric fabric.
Petrographically identical samples of so-called "Silasia granite" were medium-grained biotite granite with allotriomorphic
grains (quartz, feldspar) with the exception of biotite (hypidiomorphic) and directionless structure.
The potassium feldspar, which consists of orthose and microcline, is intensely weathered and has an allotriomorphic
texture and albitised pertites.
Shim, "Effect of Ti addition on mixed microstructure of allotriomorphic
and bainitic ferrite in wrought C-Mn steels," Materials Science Forum, vol.
This inequigranular (to subequigranular) rock is hypidiomorphic to allotriomorphic
. Perthitic alkali feldspar (41-42%), quartz (40-42%), and plagioclase (2-3%) are their essential constituents while biotite, garnet, muscovite, apatite, sphene, and zircon are the commonly occurring accessory minerals.
The metallographic analysis showed us that the microstructure after thixoforming consists of polyhedral austenite grains which are bordered by allotriomorphic
carbide structure after deformation.
It consists of plagioclase, quartz, and less abundant orthoclase in allotriomorphic
granular texture with less than 5% chlorite (after biotite).