Steady state creep behaviour of an AlAl2O3 alloy

Pandey, Anand; Mishra, Rajiv S.; Paradkar, Archana; Mahajan, Y. R.

doi:10.1016/s1359-6454(96)00225-x

Cited by 34 publications

(32 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a two slope behavior with different stress exponents in LSR (n ¼5.5) and HSR (n ¼8.2) has been observed by one of the present authors (Phaniraj) for creep behavior of 9Cr-1Mo steel [17]. Further, unrealistically high values of stress exponents (much higher than n¼5) are generally observed for creep behavior of precipitation and dispersion strengthened alloys [17][18][19]22,[32][33][34][35][36][37][38][39][40]. This has been overcome by rationalizing the steady-state creep rate in terms of an effective stress which is the difference between the applied stress and the resisting stress [22,[32][33][34][35][36][37][38][39][40].…”

Section: Determination Of Resisting Stresssupporting

confidence: 66%

“…Further, unrealistically high values of stress exponents (much higher than n¼5) are generally observed for creep behavior of precipitation and dispersion strengthened alloys [17][18][19]22,[32][33][34][35][36][37][38][39][40]. This has been overcome by rationalizing the steady-state creep rate in terms of an effective stress which is the difference between the applied stress and the resisting stress [22,[32][33][34][35][36][37][38][39][40]. The resisting stress is a measure of resistance to dislocation motion caused by other dislocations and by strengthening precipitates/particles as in the case of precipitation/dispersion strengthened alloys.…”

Section: Determination Of Resisting Stressmentioning

confidence: 99%

“…In the method proposed by Lagneborg and Bergman [22] and subsequently followed by other researchers [17][18][19] for determining resisting stress, it is assumed that the mechanism changes from climb by-pass over particles at lower stresses to Orowan bowing or particle shearing at higher stresses causing the threshold stress. The concept of resisting stress pioneered by Threadgill and Wilshire [32] has been widely used to rationalize the creep behavior of precipitation hardened alloys [32][33][34][35][36][37], dispersion strengthened alloys [38][39][40], Cr-Mo ferritic steels [17,19], Ni-Al hardened austenitic stainless steel [18] and composite materials [41,42].…”

Section: Determination Of Resisting Stressmentioning

confidence: 99%

See 2 more Smart Citations

Resisting stress for constitutive analysis of hot deformation in modified 9Cr–1Mo (P91) steel

Samantaray

Phaniraj

Bhaduri

et al. 2013

Materials Science and Engineering: A

View full text Add to dashboard Cite

Section: Determination Of Resisting Stresssupporting

confidence: 66%

Section: Determination Of Resisting Stressmentioning

confidence: 99%

Section: Determination Of Resisting Stressmentioning

confidence: 99%

See 1 more Smart Citation

Resisting stress for constitutive analysis of hot deformation in modified 9Cr–1Mo (P91) steel

Samantaray

Phaniraj

Bhaduri

et al. 2013

Materials Science and Engineering: A

View full text Add to dashboard Cite

“…[21] Tensile creep tests were carried out in air on the as-rolled, 2-TC, and 8-TC samples at 350°C (T = 423 K) under an applied stress (r) of 21 MPa on an ATS 2320 creep testing machine. The experimental conditions used for this study are similar to what has been reported in the literature [22][23][24] for creep studies on DRA composites. The homologous temperature (T/T M ) % 0.67 and the applied stress normalized by the shear modulus (r/G) % 8 9 10 À4 were chosen in this study in order to have dislocation creep as the dominant mechanism, as predicted by the Weertman-Ashby creep deformation mechanism maps.…”

Section: Creep Testsmentioning

confidence: 84%

Effect of Thermal Cycling on Creep Behavior of Powder-Metallurgy-Processed and Hot-Rolled Al and Al-SiC Particulate Composites

Pal

Bhanuprasad

Mitra

et al. 2009

Metall Mater Trans A

View full text Add to dashboard Cite

The tensile creep behavior of powder metallurgy (P/M)-processed and hot-rolled commercially pure Al and Al-5 or Al-10 vol pct SiC particulate composites has been evaluated after subjecting to 0, 2, and 8 thermal cycles between 500°C and 0°C with rapid quenching. The images of microstructures obtained using scanning and transmission electron microscopy as well as changes in the electrical resistivity, Young's modulus, and microhardness have been examined in the samples subjected to thermal cycling, in order to compare the effects of structural damage and strengthening by dislocation generation. The damage is caused by voids formed by vacancy coalescence, and is more severe in pure Al than in Al-SiC p composites, because the particlematrix interfaces in the composites act as effective sinks for vacancies. Creep tests have shown that the application of 2 thermal cycles lowers the creep strain rates in both pure Al and Al-SiC p composites. However, the creep resistance of pure Al gets significantly deteriorated, unlike the mild deterioration in the Al-5 SiC p composite, while the time to rupture for the Al-10 SiC p composite is increased. The dislocation structure and subgrain sizes in the Al and in the matrices of the Al-SiC p composites in the as-rolled condition, after thermal cycling, and after creep tests, have been compared and related to the creep behavior. The dimple sizes of the crept fracture surfaces appear to be dependent on the void density, tertiary component of strain, and time to rupture.

show abstract

“…[25,26] Zhu et al [20] have reported a change of stress exponent from 2.3 to 7.2 with increasing applied stress for the TiBw/ the 15 vol pct TiBw/Ti composite, [22] is used for the present Ti-6Al-4V composite. However, no change of stress expoanalysis.…”

Section: Resultsmentioning

confidence: 99%