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材料导论
材料导论
1
In the first video of Module 1, the examples used to demonstrate the successful application of materials include（）
2
Which of the following characteristics is not desirable for the materials used to make the helmets?
3
Which of the following materials belong to advanced materials？
4
The smart materials can respond to the environmental changes
5
（）is the rule in materials selection
6
There are（）components involved in the discipline of materials science and engineering
7
The term materials science and engineering combine both（）and（）
8
Which of the following is not the approaches used to minimize any possible adverse impacts on the environment at all stages of the materials cycle?
9
Which of the following step(s) belongs (or belong) to materials cycles?
10
The materials cycle is a system that involves interactions and exchanges among materials, energy, and the environment
11
Which of the following is not ceramics?
12
Advanced materials include semiconductors, biomaterials, smart materials and nanomaterials
13
The term of（）describes the behavior of materials when subjected to some external force or condition
14
Materials engineering involves, on the basis of（）correlations, designing or engineering the structure of a material to produce a predetermined set of properties
15
MSE involves the generation and application of knowledge relating（）to their（）and uses, having interdisciplinary and multidisciplinary characteristics
16
（）means that a material, after completing its life cycle in one component, could be reprocessed and re-used in another component, then re-enter the materials cycle again
17
（）is a concept that places recycling at the beginning or design stage of the materials cycle to ensure that waste going into municipal landfills will be minimized
18
In selecting a material for a specific application, which of the following issues should be considered?
19
Materials are（）
20
Life cycle analysis is used to improve the environmental performance of products
21
Design for assembly emphasis easy product assembly by robots and other automated equipment
22
The bonding type of Aluminum is
23
O2 is a molecule
24
Because of hydrogen bonding, hydrogen fluoride (HF) has a higher boiling point than hydrogen chloride (HCl)
25
Amorphous metals develop their miscrostructure as a result of（）
26
A crystalline solid has
27
When stacked together, the unit cells form the whole crystal
28
The periodicity of any single crystal can be described by an equivalent space lattice
29
In crystallography, there are eight crystal systems and 14 Bravais lattices
30
Steel is an interstitial solid solution with impurity carbon atoms in iron crystal lattice
31
Dislocations make it easier for slip or plastic deformation to occur
32
A ductile metal becomes harder and stronger as it is subjected to cold working
33
If a crystalline solid consists of a number of grains, such material is called
34
Internal atoms have missing bonds, so, they are in higher energy states than surface atoms
35
A homogeneous part or aggregation of material that differs from another part due to difference in structure
36
When an alloy is at a temperature above the solidus but below the liquidus, it coexists as（）
37
The Gibbs rule represents a criterion for the number of phases that coexist within a system at equilibrium
38
The key word to describe the nature of covalent bond isof electrons
39
The key word to describe the nature of ionic bond is of electrons
40
Amorphous solids have onlyorder in the arrangement of constituent particles
41
If the unit cell contains an identical component in the center of the cube in addition to those at the corners of the cube, then it is called（）
42
When impurity atoms are found in the voids or interstices among the host atoms, it is called a/ansolid solution
43
When impurity atoms replace the host atoms, it is called a/an solid solution
44
Which one is the curve that represents the temperatures at which solidification begins?
45
Primary bonding is the forces within a molecule, while secondary bonding is the forces between molecules
46
In Polymers, bonds inside the long chain molecules are secondary bonding, bonds among the chains are covalent bonding
47
Long range order means the orderly arrangement of atoms extends throughout the entire material
48
If you cool molten metal at extremely rapid rate, amorphous metal can form
49
Both Face-centered cubic and Hexagonal Close-packed are close-packed crystal structures
50
The existence of point defects，impurity atoms, dislocations，grain boundary may all hinder the dislocation movement, hence weaken the materials
51
What information you can find in a stress-strain diagram?
52
Which of the below terms have same meaning?
53
A material subjects to a deformation under force and can go back to its original shape We call the material undergoes an elastic deformation
54
In a stress-strain diagram, which region refers to ductile property?
55
Which statement is correct?
56
（）is defined as a sudden application of a load confined to a localized area of a material
57
Which of the below statement are correct?
58
Adding more carbon, the steel show（）transition temperature ranges
59
High temperature may change a ductile material into brittle
60
A brittle material has very little plastic deformation
61
When broken, cross-section image of a ductile material has flake-like structure
62
The（）the stress is applied to the material, the less cycle it will endure before its failure
63
Fatigue limits of a typical ferrous alloy is about（）tensile strength
64
All materials have a fatigue limit
65
Which statements about creep forming is correct?
66
Creep happens at specific temperatures
67
The creep rate is higher at a high temperature
68
What is range of Mohs Scale?
69
Which one represents the hardest sample of Mohs hardness?
70
Hard materials have good resistance to（）and（）
71
The tensile strength of steel（MPa) is about 34 times of that of Brinell hardness
72
The efficiency of a material in absorbing heat is described by heat capacity
73
Material with high bonding energy has low thermal expansion coefficient
74
Polymers transmit heat mainly through free electrons
75
After a certain amount of time has elapsed under constant load, the creep strain (plastic deformation) will（）
76
The（）the heat capacity, the（）the amount of heat needed to produce a temperature change
77
What are correct for describing off-set yield strength?
78
Which statements are correct?
79
Which of the experiments are used for measuring toughness?
80
What are the methods of applying load in a fatigue test?
81
What are the typical methods for penetration testing of hardness?
82
Ductile materials can stand large plastic deformation without fracture
83
Materials with high elastic modulus are typically soft
84
Toughness is the ability or capacity of a material to absorb energy during elastic deformation
85
A ductile material will be ductile forever
86
The maximum stress that can be sustained for a specified number of cycles without fracture is called fatigue limit
87
Many nonferrous metals, such as aluminum and other non-ferrous metals exhibit no fatigue limit
88
Higher stress or higher temperature reduces the rupture time and decreases the creep rate
89
A material with high bonding energy has low thermal expansion coefficient
90
Generally, the atoms in metals are typically arranged in one of three common crystal structures:（）,（）, and（）
91
From the microstructure, atoms in metals and their alloys are arranged in a very orderly manner
92
With regard to the mechanical properties, metals are typically hard, also relatively stiff and strong when in solid state
93
A two –phase mixture of ferrite and cementite is
94
From the iron-carbon phase diagram, which of the following phases/phase combinations is present for a steel composition of 07wt % C at 700°C
95
The eutectic concentration of carbon is 076%
96
（）is usually performed after quenching
97
A thermal process to toughen the high carbon steel by providing more ductility is（）
98
According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types
99
Cast iron is the most widely used engineering material, and also the most recycled of all materials
100
Refractory metals include niobium (Nb),（）,（）, and（）
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