Experimental and computational study on the load-jump tests of Al–Mg solid–solution alloy using instrumented indentation technique
✍ Scribed by H. Takagi; M. Dao; M. Fujiwara
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 250 KB
- Volume
- 423
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
Constant-load tests and load-jump tests were carried out using a microindenter in Al-5.3 mol% Mg solid-solution alloy. When the representative stress σ beneath the indenter decreases to a critical stress level, σc ∼ = 61 MPa, during indentation creep at 573 K, the stress exponent n for creep changes from 5 ( σ > σc ) to 3 (σ < σc ). With load-jump tests in the stress range of n = 3, instantaneous plastic deformation (IPD) is initiated at stresses of σ > 54 MPa or more. When IPD does not occur, the n value obtained from load-jump tests agrees fairly well with that of constant-load tests. The experimental results are supported by finite-element simulations on load-jump tests. In order to evaluate the n value robustly by the load-jump test, the test should be conducted under a loading condition at which only elastic deformation takes place or no IPD occurs.