第三章 相图（题解）.pdfVIP

3 1. - P-T αβγ(dP/dT)α−β (dP/dT)β−γ(dP/dT)γ −α- dp ∆S m dT ∆V m α-ββ-γα-γ dp α−β ⎛∆S ⎞α−β dp β−γ ⎛∆S ⎞β−γ dp α−γ ⎛∆S ⎞α−γ ⎛ ⎞ ⎜ m ⎟ ⎛ ⎞ ⎜ m ⎟ ⎛ ⎞ ⎜ m ⎟ ⎜ ⎟ ⎜∆ ⎟ ⎜ ⎟ ⎜∆ ⎟ ⎜ ⎟ ⎜∆ ⎟ dT V dT V dT V ⎝ ⎠ ⎝ m ⎠ ⎝ ⎠ ⎝ m ⎠ ⎝ ⎠ ⎝ m ⎠ (∆S )α−γ(∆V )α−γ m m (∆S )α−γ (∆S )α−β +(∆S )β−γ (∆V )α−γ (∆V )α−β +(∆V )β−γ m m m m m m α−γ ⎛∆ ⎞α−γ ( )α−β ( )β−γ dP S ∆S + ∆S ⎛ ⎞ ⎜ m ⎟ m m ⎜ ⎟ dT ⎜∆V ⎟ ( )α−β ( )β−γ ⎝ ⎠ ⎝ m ⎠ ∆V + ∆V m m dp α−β ⎛∆S ⎞α−β dP β−γ ⎛∆S ⎞β−γ ⎛ ⎞ ⎜ m ⎟ ⎛ ⎞ ⎜ m ⎟ ⎜ ⎟ ⎜∆ ⎟ ⎜ ⎟ ⎜∆ ⎟ dT V dT V ⎝ ⎠ ⎝ m ⎠ ⎝ ⎠ ⎝ m ⎠ α−β ⎛∆S ⎞α−β ⎛( S )α−β ( S )β−γ ⎞ α−γ ⎛∆S ⎞β−γ β−γ p ∆ + ∆ P P d d d ⎛ ⎞ ⎜ m ⎟ ⎜ m m ⎟ ⎛ ⎞ ⎜ m ⎟ ⎛ ⎞ ⎜ ⎟ ⎜ ⎟ ⎜ ⎟ dT ⎜∆V ⎟ ⎜( V )α−β ( V )β−γ ⎟ dT ⎜∆V ⎟ dT ⎝ ⎠ ⎝ m ⎠ ⎝ ∆ m + ∆ m ⎠ ⎝ ⎠ ⎝ m ⎠ ⎝ ⎠ α-γα-ββ-γ 2. A-B T =1100°C T =250 A B 800°C α(13)+L(25.5) β (22) 760°C β(25)+L(30) γ(26.5)