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