[3 pts] A1. Which of the following is an example of a peritectoid reaction (wher

Question

[3 pts]               A1.       Which of the following is an example of a peritectoid reaction (where L is a liquid phase, and a, b, and g are solid phases).

[a]       L -> a + b

[b]       L + a -> b

[c]        a -> b + g

[d]       a + b -> g

[e]       L + a -> b + g

[3 pts]              A2.       If atom A and atom B are known to form a simple binary eutectic (with no intermediate phases or any other features), the melting temperature of the solid solution 90 wt% A – 10 wt% B is:

[a]       Higher than the melting temperature of pure A

[b]       Lower than the melting temperature of pure A

[c]        The same as the melting temperature of pure A

               [d]       Cannot be determined from the information given

[3 pts]               A3.       The capacity of a material to absorb energy in the elastic region is known as:

[a]       Toughness

[b]       Ductility

[c]        Tensile strength

[d]       Resilience

[3 pts]               A4.       Which of the following CANNOT be obtained from a phase diagram?

[a]       Phases present

[b]       Composition of the phases

[c]        Kinetics of the phases

[d]       Relative amounts of the phases

[3 pts]               A6.       In comparing material A and material B via the table below, which is more ductile?

E (GPa)

sY (MPa)

ef

Material A

140

120

0.001

Material B

100

120

0.1

[a]       Material A

[b]       Material B

[c]        Both materials are equally ductile

[d]       Not enough information

[3 pts]               A7.       In comparing material A and material B via the table in A6, which has a higher toughness?

[a]       Material A

[b]       Material B

[c]        Both materials are equally tough

[d]       Not enough information

[3 pts]               A8.       Which of the following mechanisms can be used to stop crack growth in partially stabilized zirconia?

[a]       Cold working

[b]       Strain hardening

[c]        Transformation toughening

[d]       None of the above

[3 pts]               A9.       Which of the following is NOT true for deformation by slip as compared to deformation by twinning?

[a]       Slipping does not involve a crystallographic reorientation

[b]       Slipping occurs in metals having many slip systems

[c]        Slipping results in relatively large deformations

[d]       Slipping does not occur in atomic spacing multiples

E (GPa)

sY (MPa)

ef

Material A

140

120

0.001

Material B

100

120

0.1

Explanation / Answer

A1

peritectoid reaction : A three-phase reaction in which, upon cooling, two solid phases transform to give a third solid phase

Answer : [d]       a + b -> g

A 2 :

Lower than the melting temperature of pure A

A3 : Resilience

A4 :Kinetics of the phases

A6: Material A

A7: Same toughness as mYa is same

A8 : Transformation toughening

A9 :We know that

Slip is a permanent displacement of one part of crystal relative to the other part. he orientation of the crystal remains the same.

Not true is Slipping does not occur in atomic spacing multiples

As During slip each atom usually moves same integral number of atomic distances along the slip plane producing a step

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.