Creep Deformation of Al-Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; and Al-Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt;-Si Alloys

Matsuura, Kiyotaka; Matsuda, Norio

doi:10.2320/jinstmet1952.48.5_504

Cited by 5 publications

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“…exponent n ranges about from 7 to 8 in a coarse grained Al-Al2O3 binary alloy, in which the effect of grain boundary sliding on creep is small (5). Though the value of n is close to the one shown by Sherby et al (n=8), it is not clear whether those creep behaviour are due to the formation of stable subboundaries or due directly to the existence of dispersed particles which are obstacles to the motion of dislocations.…”

mentioning

confidence: 69%

“…At high temperatures above 773K, however, a tendency to creep appreciably at stress lower creased with the decrease in the grain size. This shows that the effect of grain boundary sliding on creep becomes large in a low stress range at high temperatures (5) . It was considered by Clauer and Hansen(4) without solid foundation that the relatively large creep rates, observed in creep deformation at 873K for the Al-Al2O3 alloy containing Al2O3 particles of about the same size as in the present alloy, were due to the grain boundary sliding.…”

mentioning

confidence: 77%

“…9 Orowan stress at high temperatures, is due to a non-mechanical pinning process which results from an attractive interaction between dislocations and dispersed particles. The threshold K for the coarse-grained Al-Al2O3(B) alloy, in which the effect of grain boundary sliding was supposed to be small, was about a half of 0.2% proof stress at room temperature which was a criterion for Orowan stress (5 Qp, Qgb and Q1 are the activation energy for pipe diffusion, that for grain boundary diffusion and that for lattice diffusion, respectively and D0p, D0gb and D0l the respective frequency factors. The stress dependences of the creep rate due to grain boundary sliding estimated from these empirical equations are far different from the results obtained in this work.…”

Section: Grain Boundary Slidingmentioning

confidence: 99%

“…Another feature, the existence of threshold the specimen with coarse grains was about 1/2 of 0.2% proof stress at room temperature (5). At high temperatures above 773K, however, a tendency to creep appreciably at stress lower creased with the decrease in the grain size.…”

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confidence: 96%

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Creep Behaviour and Dislocation Structures in Al–Al2O3 Alloys

Matsuda

Matsuura

1987

Trans. JIM

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Creep tests at high temperatures have been carried out in an Al-Al2O3 binary alloy and an Al-Al2O3-Si ternary alloy with different grain sizes. Dislocation structures after the steady-state creep have been observed in the temperature range from about 473K to 873K. The creep behaviour and the contribution of grain boundary sliding in a low stress range at temperatures above 773K have been examined in detail in the Al-Al2O3 alloy.Dislocations were generally distributed rather uniformly, being pinned to dispersed particles when crept at temperatures below 673K, though incomplete subboundaries were occasionally observed in a high stress range. On the other hand, when crept at temperatures above 773K, sharp subboundaries, which appeared to be formed associated with the grain boundary sliding, were often observed with the uniform distribution of dislocations. At temperatures above 773K, the Al-Al2O3 alloy was deformed at relatively large creep rates under stress lower than the threshold value which was estimated at temperatures below 673K, that is, the temincreasing testing temperature and with decreasing grain size. The contribution of grain boundary sliding to the total creep strain ranged from about 10 to 30% when crept at temperatures above 773K, and the mechanism of creep deformation occurring in this temperature range was discussed.

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mentioning

confidence: 69%

mentioning

confidence: 77%

Section: Grain Boundary Slidingmentioning

confidence: 99%

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confidence: 96%

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Creep Behaviour and Dislocation Structures in Al–Al2O3 Alloys

Matsuda

Matsuura

1987

Trans. JIM

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Threshold Stress for High-Temperature Creep in Particle Strengthened Al-1.5 vol%Be Alloys

et al. 1990

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Creep Behavior and Threshold Stress of an Al–Al2O3–Zr Alloy

Matsuda

Matsuura

1990

Mater. Trans., JIM

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Creep Deformation of Al-Al<SUB>2</SUB>O<SUB>3</SUB> and Al-Al<SUB>2</SUB>O<SUB>3</SUB>-Si Alloys

Cited by 5 publications

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Creep Behaviour and Dislocation Structures in Al–Al<SUB>2</SUB>O<SUB>3</SUB> Alloys

Creep Behaviour and Dislocation Structures in Al–Al<SUB>2</SUB>O<SUB>3</SUB> Alloys

Threshold Stress for High-Temperature Creep in Particle Strengthened Al-1.5 vol%Be Alloys

Creep Behavior and Threshold Stress of an Al–Al<SUB>2</SUB>O<SUB>3</SUB>–Zr Alloy

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Creep Deformation of Al-Al<SUB>2</SUB>O<SUB>3</SUB> and Al-Al<SUB>2</SUB>O<SUB>3</SUB>-Si Alloys

Cited by 5 publications

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Creep Behaviour and Dislocation Structures in Al&ndash;Al<SUB>2</SUB>O<SUB>3</SUB> Alloys

Creep Behaviour and Dislocation Structures in Al&ndash;Al<SUB>2</SUB>O<SUB>3</SUB> Alloys

Threshold Stress for High-Temperature Creep in Particle Strengthened Al-1.5 vol%Be Alloys

Creep Behavior and Threshold Stress of an Al&ndash;Al<SUB>2</SUB>O<SUB>3</SUB>&ndash;Zr Alloy

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Creep Behaviour and Dislocation Structures in Al–Al<SUB>2</SUB>O<SUB>3</SUB> Alloys

Creep Behaviour and Dislocation Structures in Al–Al<SUB>2</SUB>O<SUB>3</SUB> Alloys

Creep Behavior and Threshold Stress of an Al–Al<SUB>2</SUB>O<SUB>3</SUB>–Zr Alloy