纯铁发生γ→a多形性转变，设界面是非共格的，估计在1150K以及900K时a-Fe界面迁移速度。晶界扩散激活能近似为120kJ/mol，原子间距≈0.248nm。两相的摩尔自由能差为
其中系数：
[ 温度范围/K
A.
B.
C.
D.E
740＜T≤860 -269693 1294.373 -2.288242 1.7794× </TD>
<TD>-5.156663× </TD></TR>
<TR>
<TD>860＜T≤940</TD>
<TD>5442896</TD>
<TD>-24104.31</TD>
<TD>40.02958</TD>
<TD>-2.953537× </TD>
<TD>8.167968× </TD></TR>
<TR>
<TD>940＜T≤1080</TD>
<TD>243631.7</TD>
<TD>-932.2832</TD>
<TD>1.350039</TD>
<TD>-8.736977× </TD>
<TD>2.126265× </TD></TR>
<TR>
<TD>1080＜T≤1240</TD>
<TD>587297</TD>
<TD>-1967.562</TD>
<TD>2.473726</TD>
<TD>-1.382798× </TD>
<TD>2.898708× </TD></TR></TBODY></TABLE>]