Phase Constitution and Heat Treatment Behavior of Titanium-Manganese Alloys
Phase Constitution and Heat Treatment Behavior of Titanium-Manganese Alloys
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钛锰合金的相组成及热处理行为
DOI：
10.4028/www.scientific.net/msf.638-642.425
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Niinomi
中科院分区：
文献类型：
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作者：
M. Ikeda;M. Ueda;R. Matsunaga;M. Ogawa;M. Niinomi
虽然钛被认为是一种无处不在的元素，因为它在所有元素中克拉克数排名第十，但它被归类为稀有金属，因为目前的提炼过程比提炼铁和铝的过程对环境的破坏更大。此外，钛合金的β稳定元素（如V、Mo、Nb和Ta）由于地壳丰度低而非常昂贵。锰也被认为是一种普遍存在的元素，因为它在所有元素中克拉克数排名第12位。因此，锰是一种很有前途的钛合金元素，特别是作为β稳定剂。为了使β钛合金成为普遍存在的金属材料，研究钛锰合金的性能是非常重要的。采用电阻率、维氏硬度（HV）、x射线衍射（XRD）和光学显微镜等方法，研究了Ti-3.3 ~ 8.7质量% Mn合金的相组成及其热处理的影响。在1173 K淬火的3.3、5.1和6.0质量% Mn合金中，XRD检测到′马氏体和相，而在8.7质量% Mn合金中，只检测到相。当Mn含量达到6.0质量% Mn时，两种温度下的电阻率均随Mn含量的增加而增加，在6.0质量% Mn时，电阻率的正温度依赖关系变为负温度依赖关系。LN随Mn含量的增加而逐渐增加，Mn含量达到8.7质量% Mn时，RT明显下降。HV随Mn含量的增加而增加，达到5.1%质量%后开始下降。在Ti-3.3质量%Mn和5.1质量%Mn合金中，由于′马氏体的分解，电阻率和电阻率比随着等时热处理温度的升高而降低。在6.0Mn和8.7Mn合金中，由于等温析出，随着等时热处理温度的升高，电阻率和电阻率比降低，而维氏硬度升高。随着Mn含量的增加，降水开始的温度也随之升高。
Although titanium is considered to be a ubiquitous element since it has the tenth highest Clarke number of all elements, it is classified as a rare metal because the current refinement process is more environmentally damaging than the processes used to refine iron and aluminum. Furthermore, the beta stabilizing elements of titanium alloys (e.g., V, Mo, Nb, and Ta) are very expensive due to their low crustal abundances. Manganese is also considered to be a ubiquitous element, since it has the 12th highest Clarke number of all elements. Therefore, manganese is a promising alloying element for titanium, especially as a beta-stabilizer. In order to develop beta titanium alloys as ubiquitous metallic materials, it is very important to investigate the properties of Ti-Mn alloys. In this study, the phase constitution of and the effect of heat treatment on Ti-3.3 to 8.7 mass% Mn alloys were investigated by electrical resistivity and Vickers hardness (HV) measurements and by X-ray diffraction (XRD) analysis and optical microscopy. In 3.3, 5.1, and 6.0 mass% Mn alloys quenched from 1173 K, ’ martensite and phase were identified by XRD, whereas in the 8.7 mass% alloy, only the phase was detected. The resistivities at both temperatures increased with increasing Mn content up to 6.0 mass% Mn and the positive temperature dependence of resistivity became negative at 6.0 mass% Mn. LN increased gradually with increasing Mn content up to 8.7 mass% Mn, whereasRT decreased considerably at a Mn content of 8.7 mass% Mn. HV increased with increasing Mn content up to 5.1 mass%, after which it began to decrease. In Ti-3.3 mass%Mn and 5.1 mass%Mn alloys, the resistivity and the resistivity ratio decreased with increasing temperature of isochronal heat treatment because of decomposition of ’ martensite. In 6.0Mn and 8.7Mn alloys, the resistivity and the resistivity ratio decreased, while Vickers hardness increased with increasing temperature of isochronal heat treatment because of isothermal precipitation. Furthermore, the temperature for the onset of precipitation increased with higher Mn content.