• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Symposium Proceedings vol.842; Symposium on Integrative and Interdisciplinary Aspects of Intermetallics; 20041129-1201; Boston,MA(US) >Factors for Controlling Martensitic Transformation Temperature of TiNi Shape Memory Alloy by Addition of Ternary Elements
【24h】

Factors for Controlling Martensitic Transformation Temperature of TiNi Shape Memory Alloy by Addition of Ternary Elements

机译：添加三元元素控制TiNi形状记忆合金马氏体转变温度的因素

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Correlations between the changes in martensitic transformation start temperature (M_s) by addition of ternary elements X and several factors of the ternary additions were investigated for TiNi shape memory alloy. The change of M_s by addition of lmol%X is referred to as ΔM_s (in K/mol%), and ΔM_s was systematically evaluated by differential scanning calorimetry experimentally using (Ti, X)_(50)Ni_(50) solution-treated at 1273K for 3.6ks where the Ni content was kept constant to be 50mol%. The ternary additions X investigated are the transition metal (TM) elements selected from 4th period group (Zr, Hf) to 10th period group (Pd, Pt). The factors investigated are (1) the number of total outer d-and s-electrons (N_(ele)), and electron hole number (N_V), (2) electronegativity (E_N), (3) atomic volume (V_X) and (4) Mendeleev number (N_M). It was found that the values of ΔM_s are different even in a same period group; ΔM_s of 6th period group are-133K/mol%Cr (3d-TM), -152K/mol%Mo (4d-TM) and -64K/mol%W (5d-TM) for example. The results found in the correlations between ΔM_s and those factors are summarized as follows. (1) ΔM_s depends on N_(ele) and N_V. However, the data are scattered because same N_(ele) and N_V are often given in a same period group. Then, other factors than N_(ele) and N_V are required for clear understanding of ΔM_s. (2) ΔM_s seems to become lowered slightly with increasing E_N. (3) ΔM_s weakly depends on atomic volume V_X. Ternary addition with large V_X increases ΔM_s slightly, and with small V_X decreases ΔM_s largely. Since the stress field must be formed by substitution due to size mismatch, the type of stress field, tension/compression, may be an important role to determine the sign of ΔM_s. (4) ΔM_s shows a good correlation with N_M as -9.4Kmol%~(-1)/ΔN_M where ΔN_M is the difference in N_M. This suggests that a ternary alloying element with smaller (larger) N_M stabilizes the B19' martensite (B2 parent) phase. Effect of site occupancy on M_s is also discussed only for Cr.
机译：对于TiNi形状记忆合金，研究了三元元素X的添加引起的马氏体相变开始温度（M_s）变化与三元添加的若干因素之间的相关性。通过添加lmol％X引起的M_s的变化称为ΔM_s（以K / mol％为单位），并且使用（Ti，X）_（50）Ni_（50）溶液处理，通过差示扫描量热法系统地评估了ΔM_s在1273K下进行3.6ks，其中Ni含量保持恒定为50mol％。研究的三元添加物X是选自第四周期组（Zr，Hf）至第十周期组（Pd，Pt）的过渡金属（TM）元素。研究的因素是（1）总外d电子和s电子数（N_（ele））和电子空穴数（N_V），（2）电负性（E_N），（3）原子体积（V_X）和（4）门捷列夫号（N_M）。发现即使在相同的时间段组中，ΔM_s的值也不同。第六周期组的ΔM_s例如为-133K / mol％Cr（3d-TM），-152K / mol％Mo（4d-TM）和-64K / mol％W（5d-TM）。在ΔM_s与那些因素之间的相关性中发现的结果总结如下。 （1）ΔM_s取决于N_（ele）和N_V。但是，由于经常在同一周期组中提供相同的N_（ele）和N_V，因此数据分散。然后，为了清楚地理解ΔM_s，需要除N_（ele）和N_V以外的其他因素。 （2）ΔM_s似乎随着E_N的增加而略微降低。 （3）ΔM_s弱依赖于原子体积V_X。 V_X大的三元加法会稍微增加ΔM_s，V_X小的三元加法会大大减小ΔM_s。由于应力场由于尺寸不匹配而必须通过置换形成，因此应力场的类型（拉伸/压缩）可能是确定ΔM_s符号的重要角色。 （4）ΔM_s与N_M具有良好的相关性，为-9.4Kmol％〜（-1）/ΔN_M，其中ΔN_M为N_M的差。这表明具有较小（较大）N_M的三元合金元素可稳定B19'马氏体（B2母体）相。也仅针对Cr讨论了站点占用对M_s的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号