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首页> 外文期刊>Materials Science and Engineering >Effect of minor Gd addition on the microstructure and creep behavior of a cast Al-15Mg_2Si in situ composite
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Effect of minor Gd addition on the microstructure and creep behavior of a cast Al-15Mg_2Si in situ composite

机译：微量Gd对Al-15Mg_2Si铸造原位复合材料组织和蠕变性能的影响。

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摘要

The influence of 0.5 wt% Gd addition on the microstructure and creep behavior of a cast Al–15Mg2Si composite was studied by means of compression tests under different constant stresses in the range of 50–250 MPa, corresponding to the modulus-compensated stress levels of 0.002 ≤σ/G≤ 0.011, in the temperature range of 473–563 K. Analysis of the data showed that for all loads and temperatures, the Al–15Mg2Si–0.5Gd composite had lower creep rates, and therefore, higher creep resistances than the base composite. This is ascribed to the morphological modification of the primary Mg2Si particles, refinement of the eutectic structure, significant reduction in the size and volume fraction of the primary Mg2Si particles, and the formation of the fine thermally stable MgGd intermetallic phase at the grain boundary areas. Based on the obtained stress exponents of 4.6–5.9 and stress-dependent activation energies, which are close to that of the lattice self-diffusion in pure aluminum, it can be proposed that the dominant creep mechanism in the present composites is stress-assisted dislocation climb controlled by lattice self-diffusion.
机译：通过在50-250 MPa范围内的不同恒定应力下，通过压缩试验研究了添加0.5 wt％的Gd对铸造的Al-15Mg2Si复合材料的组织和蠕变行为的影响。 0.002≤σ/G≤0.011，在473–563 K的温度范围内。数据分析表明，在所有负载和温度下，Al–15Mg2Si–0.5Gd复合材料的蠕变速率较低，因此，其抗蠕变性比基础复合材料。这归因于初级Mg2Si颗粒的形态改性，共晶结构的细化，初级Mg2Si颗粒的尺寸和体积分数的显着降低以及在晶界区域形成了精细的热稳定MgGd金属间相。基于所获得的应力指数为4.6–5.9以及与应力相关的活化能，其与纯铝中的晶格自扩散相近，可以提出，本复合材料的主要蠕变机理是应力辅助位错由晶格自扩散控制的爬升。

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