Influence of minor additions of boron and zirconium on shape memory properties and grain refinement of a Cu-Al-Mn shape memory alloy
Influence of minor additions of boron and zirconium on shape memory properties and grain refinement of a Cu-Al-Mn shape memory alloy
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DOI：
10.1051/esomat/200905028
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
V. Sampath;U. Mallik
中科院分区：
文献类型：
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作者：
V. Sampath;U. Mallik
Cu基合金与12.5wt. %的Al和5 wt. % Mn，具有不同量（0.05-2.00重量%）用铸锭冶金法制备了硼或锆。将合金锭均质化，然后进行分步淬火，以获得完全马氏体的结构。随后，其特征在于，通过光学发射光谱法，差示扫描量热法和光学显微镜。通过弯曲和拉伸试验研究了合金的形状记忆和超弹性性能。本研究揭示了硼作为一种良好的晶粒细化剂，导致晶粒尺寸减小约80%。虽然它也提高了相变温度约10 ℃，但它使形状记忆效应引起的应变恢复降低了4%，使超弹性引起的应变恢复降低了约2%。通过对添加B和Zr的合金的晶粒细化效果的比较，发现B是Cu-Al-Mn自润滑合金的较好晶粒细化剂。
Cu-base alloys with 12.5 wt. % Al and 5 wt. % Mn with different amounts (0.05-2.00 wt.%) of boron or zirconium were prepared by ingot metallurgy route. The alloy ingots were homogenized followed by step quenching so as to obtain a structure that is completely martensitic. They were subsequently characterized by optical emission spectrophotometry, differential scanning calorimetry and optical microscopy. The shape memory and superelastic properties of the alloys were studied by bend and tensile test. The present study brings to light that boron acts as a good grain refiner, resulting in a reduction of about 80% in grain size. While it also increases the transformation temperatures by ~ 10 o C, it decreases the strain recovery by shape memory effect by 4%, and that by superelasticity by ~ 2%. A comparison of the results of the alloy with B addition with that with Zr addition reveals that B is a better grain refiner for Cu-Al-Mn SMAs.