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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 10 :Phase Transformation In Metals"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 10.1 Page no 318"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#(a)Computation of Critical Nuclear Radius\n",
+      "\n",
+      "#Given\n",
+      "Hf=-1.16*10**9     # in J/m**3  latent heat of fusion\n",
+      "Y=0.132            # in J/m**2  Surface energy\n",
+      "Tm=1064.0+273.0        # in K  Melting point of gold\n",
+      "\n",
+      "#calculation\n",
+      "import math\n",
+      "T=Tm-230.0           # in K  230 is supercooling value\n",
+      "r=-2*Y*Tm/(Hf*(Tm-T))\n",
+      "G=16*math.pi*Y**3*Tm**2/(3*Hf**2*(Tm-T)**2)\n",
+      "\n",
+      "#part (b)\n",
+      "a=0.413*10**-9  # in m  Unit Cell edge length\n",
+      "#unit cells per paticle\n",
+      "u_c=4*math.pi*r**3/(3*a**3)\n",
+      "n=4            #In FCC . no of atoms in per unit cell\n",
+      "U_c=int(u_c)*n\n",
+      "\n",
+      "#Result\n",
+      "print\"(a)Critical Radius is \",round(r/10**-9,2),\"nm\"\n",
+      "print\"Activation free energy is \",round(G,21),\"J\"\n",
+      "print\"(b)Total no. of atoms per critical nucleus are \",U_c\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(a)Critical Radius is  1.32 nm\n",
+        "Activation free energy is  9.68e-19 J\n",
+        "(b)Total no. of atoms per critical nucleus are  548\n"
+       ]
+      }
+     ],
+     "prompt_number": 11
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": [
+      "Example 10.2 Page no 335"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Determination the rate of recrystallization\n",
+      "\n",
+      "#Given\n",
+      "n=5.0\n",
+      "y=0.3\n",
+      "t=100.0          #in min\n",
+      "\n",
+      "#Calculation\n",
+      "k=-math.log(1-y)/t**n\n",
+      "thalf=(-math.log(1-0.5)/k)**(1/n)\n",
+      "rate=1/thalf\n",
+      "\n",
+      "#Result\n",
+      "print\"Rate is \",rate,\"min**-1\"\n",
+      "\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Rate is  0.00875567087531 min**-1\n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file