METALLURGY - EXAM #1 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+
Physical Properties Ans✓✓✓properties that identify the reaction of the
material to forms of energy like heat, electricity, etc. (density, color,
melting point, boiling point, etc.
Chemical Properties Ans✓✓✓Properties that become apparent during
chemical reaction (heat of combustion, reactivity to other chemicals,
ionization potential)
Mechanical Properties Ans✓✓✓These are properties that identify the
reaction of the material to an applied force
Tensile Strength Ans✓✓✓the resistance to being pulled apart
Compressive Strength Ans✓✓✓Opposite of tensile strength
Approx. 3 times greater than the tensile strength
Shear Strength Ans✓✓✓Resistance to sliding action
Torsion Strength Ans✓✓✓the resistance to a twisting force
Fatigue Strength Ans✓✓✓resistance to cyclic loading
,Flexural Strength Ans✓✓✓the resistance to a bending force
Hardness Ans✓✓✓the resistance of a material to permanent indentation
or abrasion
Toughness Ans✓✓✓The ability of a metal to resist fracture or absorb
energy under the effect of shock loading. The more energy required to
break a metal the better the toughness.
Ductility Ans✓✓✓the ability to deform plastically without failure
Elasticity Ans✓✓✓the ability to stretch without permanent deformation
Properties fo a material are dependent on which 3 things? Ans✓✓✓1)
Composition(the chemical elements in them and how they bond)
2) Internal Structure (crystal structure in metals)
i. Now metals have a definite crystal structure as a solid (this means
they have a repeating orientation)
ii. This is as opposed to non-metals (amorphous) that have no
systematic arrangement to the molecules that make them up
3) Service Conditions
, How can we control material properties? Ans✓✓✓We usually have no
or little control over service conditions, therefore the way we can control
material properties is by controlling composition and internal structure
What are 4 types of bonds that can hold atoms together Ans✓✓✓1)
Ionic - elements donate or accept valence electrons (two unlike element
NaCl or table salt)
2) Covalent - sharing of valence electrons (two like atoms that form a
molecule Cl2 or chlorine)
3) Van der Waal's Forces - weak positive an negative attractions without
combining (typical of thermoplastics)
4) Metallic Bonds - attractive forces between an array of positive ions
and a cloud of electrons.
The electrons are free to move about
- the delocalized nature of these bonds make it possible for atoms to
slide past one another when the metal is being deformed instead of
fracturing
In the liquid state, atoms in metals have which two forms of energy?
Ans✓✓✓Kinetic and Potential
DETAILED ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+
Physical Properties Ans✓✓✓properties that identify the reaction of the
material to forms of energy like heat, electricity, etc. (density, color,
melting point, boiling point, etc.
Chemical Properties Ans✓✓✓Properties that become apparent during
chemical reaction (heat of combustion, reactivity to other chemicals,
ionization potential)
Mechanical Properties Ans✓✓✓These are properties that identify the
reaction of the material to an applied force
Tensile Strength Ans✓✓✓the resistance to being pulled apart
Compressive Strength Ans✓✓✓Opposite of tensile strength
Approx. 3 times greater than the tensile strength
Shear Strength Ans✓✓✓Resistance to sliding action
Torsion Strength Ans✓✓✓the resistance to a twisting force
Fatigue Strength Ans✓✓✓resistance to cyclic loading
,Flexural Strength Ans✓✓✓the resistance to a bending force
Hardness Ans✓✓✓the resistance of a material to permanent indentation
or abrasion
Toughness Ans✓✓✓The ability of a metal to resist fracture or absorb
energy under the effect of shock loading. The more energy required to
break a metal the better the toughness.
Ductility Ans✓✓✓the ability to deform plastically without failure
Elasticity Ans✓✓✓the ability to stretch without permanent deformation
Properties fo a material are dependent on which 3 things? Ans✓✓✓1)
Composition(the chemical elements in them and how they bond)
2) Internal Structure (crystal structure in metals)
i. Now metals have a definite crystal structure as a solid (this means
they have a repeating orientation)
ii. This is as opposed to non-metals (amorphous) that have no
systematic arrangement to the molecules that make them up
3) Service Conditions
, How can we control material properties? Ans✓✓✓We usually have no
or little control over service conditions, therefore the way we can control
material properties is by controlling composition and internal structure
What are 4 types of bonds that can hold atoms together Ans✓✓✓1)
Ionic - elements donate or accept valence electrons (two unlike element
NaCl or table salt)
2) Covalent - sharing of valence electrons (two like atoms that form a
molecule Cl2 or chlorine)
3) Van der Waal's Forces - weak positive an negative attractions without
combining (typical of thermoplastics)
4) Metallic Bonds - attractive forces between an array of positive ions
and a cloud of electrons.
The electrons are free to move about
- the delocalized nature of these bonds make it possible for atoms to
slide past one another when the metal is being deformed instead of
fracturing
In the liquid state, atoms in metals have which two forms of energy?
Ans✓✓✓Kinetic and Potential
