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Effect of Ca additions on the microstructure and creep properties of a cast Mg-Al-Mn magnesium alloy

机译：Ca的添加对Mg-Al-Mn镁合金铸造组织和蠕变性能的影响

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摘要

The microstructure and creep properties of cast Mg-6Al-0.3Mn (AM60) alloys containing 0.5, 1.2, and 2.0 wt% Ca were investigated by impression creep testing method in the stress range of 150-750 MPa at temperatures from 423 to 523 K, corresponding to 0.458 < T/T_m < 0.567. Results showed that calcium addition can substantially improve creep properties by substituting β-Mg_(17)Al_(12) phase with an interconnected and thermally stable Al_2Ca phase. Unlike β-Mg_(17)Al_(12) particles that crack during creep, the network of lamellar Al_2Ca phase withstands deformation at high temperatures, and thus, improves creep resistance. Two different mechanisms were proposed for creep deformation of all alloys at different temperatures and stresses. Under low stresses and at low temperatures, stress exponents of approximately n~5 and activation energies of 75-100 kJ/mol that are close to that of the pipe diffusion are indicative of dislocation climb controlled by pipe diffusion creep mechanism. At higher stresses and temperatures, power-law breakdown leads to the stress exponent n > 8 and activation energies of about 129-165 kJ/mol that are slightly higher than that of the self-diffusion of magnesium atoms.
机译：通过压痕蠕变试验方法，在423至523 K的温度下，在150-750 MPa的应力范围内，通过压痕蠕变试验方法研究了含0.5、1.2和2.0 wt％Ca的Mg-6Al-0.3Mn（AM60）铸造Mg-6Al-0.3Mn（AM60）合金的组织和蠕变性能。 ，对应于0.458 8，活化能约为129-165 kJ / mol，略高于镁原子的自扩散能。

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