Feasibility of Thermal Strain Measurements during Quasi-Steady State Using Neutron Diffraction

Localized heating was imposed on a 6061-T6 aluminum alloy plate to cause thermal strains, and simultaneously interplanar spacing changes were measured using in-situ time-resolved neutron diffraction techniques. Two different methods were used: 1) direct real-time measurements of the transient behavior and 2) a series of measurements based on the quasi-steady state (QSS) principle. A comparison of the two results shows that the QSS method can represent the transient behavior under the current experimental conditions.

[1]  Mark R. Daymond,et al.  Thermal residual stresses in NiAl–AlN–Al2O3 composites measured by neutron diffraction , 1999 .

[2]  K. Masubuchi.  Analysis of Welded Structures , 1980 .

[3]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[4]  P. Withers,et al.  Residual stress. Part 1 – Measurement techniques , 2001 .

[5]  H. Choo,et al.  Internal strain evolution during heating of Ti-6Al-4V/SCS-6 composite , 1999 .

[6]  D. Brown,et al.  Residual stress measurements in a zircaloy-4 weld by neutron diffraction , 2004 .

[7]  P. Withers,et al.  Neutron diffraction study of stress-induced martensitic transformation and variant change in Fe-Pd , 2003 .

[8]  Xianzhen Wang,et al.  Influence of residual stress on thermal expansion behavior , 1999 .

[9]  J. Roberts,et al.  NiTi and NiTi-TiC composites: Part IV. Neutron diffraction study of twinning and shape-memory recovery , 1996 .

[10]  C. Tomé,et al.  Internal strain and texture evolution during deformation twinning in magnesium , 2005 .

[11]  W. Wang,et al.  In situ synchrotron study of phase transformation behaviors in bulk metallic glass by simultaneous diffraction and small angle scattering. , 2003, Physical review letters.

[12]  S. David,et al.  Mapping of the residual stress distribution in a brazed zirconia-iron joint , 1996 .

[13]  H. Choo,et al.  In situ neutron diffraction studies on the elevated-temperature deformation behavior of a TiAl¿W alloy , 2004 .

[14]  T. Mason,et al.  In situ generation of intergranular strains in an Al7050 alloy , 1998 .

[15]  H. Wenk,et al.  Texture changes in the hcp → bcc → hcp transformation of zirconium studied in situ by neutron diffraction , 2004 .