Residual stress development during fabrication and processing of gamma-titanium based composites

Garmestani, Hamid; Al-Haik, Marwan; Townsley, T.A; Sabinash, C.M.

doi:10.1016/s1359-6462(00)00558-3

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…Titanium aluminide-based intermetallic matrix composites (IMCs) are prone to the existence of high residual stresses during processing which can result in localized plastic deformation, matrix cracking, and ultimately in premature failure [1][2][3][4]. Residual stresses in composites are typically thermal in nature and are the result of the difference in coefficients of thermal expansion (CTE) between the fibers and the matrix.…”

Section: Introductionmentioning

confidence: 99%

Controlling Residual Stress in Metal Matrix Ceramic Fiber Composite

2006

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In metal matrix composites the nature of the reinforcement can influence the development of residual stresses not only as a result of the mismatch in the thermal expansion coefficient between the fiber and the matrix but also caused by the interface of the materials during the processing cycles. The residual stress can be minimized through controlling the processing path and the thermal environment. We studied the residual stress formation and evolution in gamma titanium aluminide (Ti-47AL-2Ta) matrix. The matrix was reinforced with three different types of fibers: Alumina, Sapphikon, and Tiboride through hot isostatic pressing. The composite was heat treated for various combinations of time: 100, 200 and 500 hours; and temperature: 590°C, 815°C and 982 °C respectively. Residual stresses were measured in the gamma phase of the matrix using X-Ray diffraction.

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Section: Introductionmentioning

confidence: 99%

Controlling Residual Stress in Metal Matrix Ceramic Fiber Composite

2006

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Aluminium – Tantalum – Titanium

Velikanova¹,

Турчанин²,

Ilyenko³

et al. 2009

Landolt-Börnstein - Group IV Physical Chemistry

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Thermal Stability of Nanocrystallized Surface Layer in Al-Zn-Mg Alloy by Surface Mechanical Attrition Treatment

Fang

Liu

et al. 2007

MSF

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After surface mechanical attrition treatment (SMAT) for Al-Zn-Mg alloy, a gradient structure with average grain size increased from 20nm in surface layer to about 100nm at a depth of 20μm was formed. The thermal stability of surface nanostructured layer in Al-Zn-Mg alloy samples was investigated by vacuum annealing at 100°C, 150°C, 200°C and 250°C for 1h, respectively. The microstructural evolution as well as the microhardness along the depth from top surface layer to matrix of SMATed samples was analyzed. Experimental results showed that the grain size of surface nanocrystallites remains in submicro-scale, ranging from 300nm to 400nm, when annealed at a temperature of 250°C, and the microhardness of surface nanostructured layer was still high compared with that of matrix, indicating satisfying thermal stability of nanocrystallized layer. This might be attributed to the presence of substantive trident grain boundaries and pinning effect of dispersive precipitated phases in nanocrystalline materials, which hindered the grain boundary migration that leading to grain growth.

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Residual stress development during fabrication and processing of gamma-titanium based composites

Cited by 5 publications

References 10 publications

Controlling Residual Stress in Metal Matrix Ceramic Fiber Composite

Controlling Residual Stress in Metal Matrix Ceramic Fiber Composite

Aluminium – Tantalum – Titanium

Thermal Stability of Nanocrystallized Surface Layer in Al-Zn-Mg Alloy by Surface Mechanical Attrition Treatment

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