Editing Eutectic system (section)

===Peritectoid===
A ''peritectoid'' transformation is a type of [[isothermal]] [[reversible reaction]] that has two solid [[Phase (matter)|phase]]s reacting with each other upon cooling of a binary, ternary, ..., ''n''-ary [[alloy]] to create a completely different and single solid phase.<ref name="Gold Book PAC,1994,66,588">{{goldbookref|title=Peritectoid reaction|file=P04501}}</ref>  The reaction plays a key role in the order and [[decomposition]] of [[quasicrystalline]] phases in several alloy types.<ref>{{cite journal |last1=Das |first1=Amit |last2=Manna |first2=Indranil |last3=Pabi |first3=S. K. |title=A numerical model of peritectoid transformation |journal=Metallurgical and Materials Transactions A |date=October 1999 |volume=30 |issue=10 |pages=2563–2573 |doi=10.1007/s11661-999-0295-2 |publisher=[[The Minerals, Metals & Materials Society]], [[ASM International]]|bibcode=1999MMTA...30.2563D |s2cid=95279944 }}</ref> A similar structural transition is also predicted for [[Cylinder sphere packing#Columnar structures created by rapid rotations|rotating columnar crystals.]]