Presenter: James A. Monroe
ALLVAR: Jay Zgarba, Jeremy McAllister
Texas A&M University: Ibrahim Karaman, Xavier Huerta
New Developments in Allvar Alloys
Traditional
Alloys
Technical
Ceramics
CuW
Thermal Conductivity, λ [Wm-1K-1]
Th
erm
al E
xp
ansio
n, |α
| [1
0-6
K-1
]
0.1
1
10
100
1000
0.01 0.1 1 10 100 1000
Composites and
Silicate Glasses
Natural
Materials
Polymer
Foams
Polymers
1
10
100
Expands with Heat
Contracts with Heat0.1
Invar
Traditional
Alloys
Technical
Ceramics
CuW
Thermal Conductivity, λ [Wm-1K-1]
Th
erm
al E
xp
ansio
n, |α
| [1
0-6
K-1
]
0.1
1
10
100
1000
0.01 0.1 1 10 100 1000
Composites and
Silicate Glasses
Natural
Materials
Polymer
Foams
Polymers
1
10
100
Expands with Heat
Contracts with Heat0.1
Invar
ALLVAR
Alloys
Introduction
Potential Application Areas
Example Athermal Problem
Single Stabilizing
Ring
Thermal Stabilizing
Rings
Fo
cu
s S
hift
Temperature
Thermal Focus Shift
Alloy 16
Material Development
Alloy 16
Alloy 16
Mechanical Properties
Invar
σµy = 70 MPa
Other Metal ALLVAR
LOther LALLVAR
LTotal
𝐿𝐴𝑉𝑜
𝐿𝑡𝑜𝑡𝑜 =
𝛼𝑡𝑜𝑡 − 𝛼𝑂𝑡ℎ𝑒𝑟𝛼𝐴𝑉 − 𝛼𝑂𝑡ℎ𝑒𝑟
𝛼𝑡𝑜𝑡 =𝐿𝐴𝑉𝑜
𝐿𝑡𝑜𝑡𝑜 𝛼𝐴𝑉 − 𝛼𝑂𝑡ℎ𝑒𝑟 + 𝐿𝑡𝑜𝑡
𝑜 𝛼𝑂𝑡ℎ𝑒𝑟
A New Design Paradigm
Ti64 Alloy16
500 um 500 um
Alloy16
Ti64500 um
Alloy16
Ti64
Welding
Ti64Alloy
16Ti64
Alloy16
Seam Bevel
Welding
~𝟐𝟓%
Other Component Geometries
R
ID OD ID OD
Conclusions
Other Metal ALLVAR
LOther LALLVAR
LTotal
Presenter: James A. Monroe
ALLVAR: Jay Zgarba, Jeremy McAllister
Texas A&M University: Ibrahim Karaman, Xavier Huerta
New Developments in Allvar Alloys