MG-CU-Y AMORPHOUS-ALLOYS WITH HIGH MECHANICAL STRENGTHS PRODUCED BY A METALLIC MOLD CASTING METHOD
MG-CU-Y AMORPHOUS-ALLOYS WITH HIGH MECHANICAL STRENGTHS PRODUCED BY A METALLIC MOLD CASTING METHOD
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DOI：
10.2320/matertrans1989.32.609
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发表时间：
1991-07-01
期刊：
影响因子：
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通讯作者：
MASUMOTO, T
中科院分区：
文献类型：
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作者：
INOUE, A;KATO, A;MASUMOTO, T
低压铸造Mg-Cu-Y熔体到铜模中，发现导致圆柱形的非晶块体。非晶圆柱体的最大直径（D（c））显示出显著的组成依赖性，并且对于Mg 65 Cu 25 Y10达到4.0mm的最大值。D（c）的组成依赖性与过冷液体区域的温度跨度Δ T（x）（= T（x）-T（g））的组成依赖性相似。这种相似性可能是因为具有大Δ-T（x）的合金对结晶相的成核和生长具有高的抵抗力，这是由于形成了具有更致密的随机堆积和最佳键合状态的无序结构。Mg 80 Cu 10 Y 10圆柱体在室温下的0.2%伸长率下的压缩屈服应力（σ-p）为822 MPa，断裂发生在沿着剪切面。σ-p保持不变，直到350 K，然后随着温度的升高显着降低，伴随着从非均匀到均匀类型的变形模式的变化。块状样品和带状样品的力学强度和变形行为没有明显的差异，表明其无序结构具有相似性。
A low pressure casting of Mg-Cu-Y melts into copper molds was found to cause amorphous bulks in a cylindrical form. The maximum diameter of the amorphous cylinder (D(c)) shows a significant compositional dependence and reaches a maximum value of 4.0 mm for Mg65Cu25Y10. The compositional dependence of the D(c) is similar to that for the temperature span of the supercooled liquid region, DELTA-T(x)(= T(x)-T(g)). The similarity is presumably because the alloy with large DELTA-T(x) has a high resistance against the nucleation and growth of a crystalline phase resulting from the formation of a disordered structure with a more dense random packing and an optimum bonding states. The compressive proof stress at an elongation of 0.2% (sigma-p) for the Mg80Cu10Y10 cylinder was 822 MPa at room temperature and the fracture occurred along the shear plane. The sigma-p remains unchanged up to 350 K and then decreases significantly with increasing temperature, accompanied by the change in the deformation mode from inhomogeneous to homogeneous type. There is no appreciable difference in the features of mechanical strengths and deformation behavior between the bulk and ribbon samples, indicating the similarity of the disordered structure.