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首页> 外文学位 >Microstructure and compressive strength of as-cast and aged niobium-rich niobium-aluminum-titanium intermetallics.
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Microstructure and compressive strength of as-cast and aged niobium-rich niobium-aluminum-titanium intermetallics.

机译：铸态和时效的富铌铌铝钛金属互化物的显微组织和抗压强度。

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摘要

As-cast Nb-Al-Ti alloys containing 15 at.% Al and 10, 25 and 40 at.% Nb were tested in compression at 298, 673, 873 and 1173 K (25, 400, 600 and 900{dollar}spcirc{dollar}C) at strain rates from 10{dollar}sp{lcub}-5{rcub}{dollar} to {dollar}rm5times10sp{lcub}-2{rcub} ssp{lcub}-1{rcub}{dollar} to a strain of 5%. The yield strength decreased with increasing temperature for each alloy at all strain rates, and increased with increasing strain rates. The stress-strain curves showed serrated yielding at test temperatures of 673 and 873 K (400 and 600{dollar}spcirc{dollar}C) and the lowers train rates. The cause of this was not determined. All alloys showed a yield point drop when tested at 1173 K (900{dollar}spcirc{dollar}C), and transmission electron microscopy indicated this was due to recovery occurring during testing. The Ti content (and hence the Nb content) had a marked effect of strength. At a given strain rate and test temperature, the strength increased considerably with increasing Nb content (decreased with increasing Ti content). This was attributed to solid solution strengthening of the ordered B2 structure, and in the 10% Ti (75% Nb) alloy, to the presence of some {dollar}delta{dollar} phase.; Aging treatments were carried out at 873, 1173 and 1373 K (600, 900 and 1100{dollar}spcirc{dollar}C) after which compression testing was conducted at 1173 K (900{dollar}spcirc{dollar}C) at a strain rate of {dollar}rm10sp{lcub}-4{rcub} ssp{lcub}-1{rcub}.{dollar} Aging the 40% Ti alloy at 873 and 1173 K (600 and 900{dollar}spcirc{dollar}C) for 10 and 100 hours, and 10 hours at 1373 K (1100{dollar}spcirc{dollar}C), did not change the strength significantly. Aging the 10 and 25% Ti alloy for 10 hours at 1173 K (900{dollar}spcirc{dollar}C) did not significantly change the strength, but aging for 100 hours increased it about 20%. Aging for 10 hours at 1373 K (1100{dollar}spcirc{dollar}C) increased the strength 30 to 40% above that of the as-cast level. For a given alloy, the increase in strength correlates with increasing amounts of {dollar}delta{dollar} formed during aging. As was found for the as-cast condition, there is a marked increase in strength with less Ti (more Nb) content and this is believed due to solid strengthening of the B2 matrix.
机译：在298、673、873和1173 K（25、400、600和900 {dol} spcirc）下，压缩测试含15at。％Al和10、25和40at。％Nb的Nb-Al-Ti合金。 {dollar} C）的应变速率从10 {dollar} sp {lcub} -5 {rcub} {dollar}到{dollar} rm5times10sp {lcub} -2 {rcub} ssp {lcub} -1 {rcub} {dollar}应变为5％。在所有应变速率下，每种合金的屈服强度均随温度升高而降低，并随应变率升高而升高。应力-应变曲线显示出在673和873 K（400和600 {spcirc {dollar} C）的测试温度下锯齿状的屈服，并且降低了应变速率。原因尚不清楚。当在1173 K（900℃）下测试时，所有合金均显示出屈服点下降，并且透射电子显微镜表明这是由于测试期间发生了恢复。 Ti含量（因此Nb含量）具有明显的强度影响。在给定的应变速率和测试温度下，强度随着Nb含量的增加而显着增加（随Ti含量的增加而降低）。这归因于有序的B2结构的固溶强化，在10％Ti（75％Nb）合金中，归因于存在一些{delta} delta {dollar}相。在873、1173和1373 K（600、900和1100 {sp} {dol}} C下进行时效处理，然后在1173 K（900 {sp} {dol}} C进行应变测试{dol} rm10sp {lcub} -4 {rcub} ssp {lcub} -1 {rcub}的速率。{dollar} 40％Ti合金在873和1173 K时效（600和900 {dollar} spcirc {dollar} C ）10个小时和100个小时，以及在1373 K（1100 {dollar} spcirc {dollar} C）下10个小时，强度没有明显改变。将10％和25％的Ti合金在1173 K（900 spspC {{dollar} C）下进行10小时的时效处理不会显着改变强度，但时效100小时会使其强度提高约20％。在1373 K（1100 {spcirc {dollar} C）下老化10小时可使强度比铸态强度高30％至40％。对于给定的合金，强度的增加与在时效过程中形成的{delta}δ{dollar}的增加相关。如在铸态条件下所发现的，强度显着增加，而Ti含量较少（Nb含量较高），这被认为是由于B2基体的牢固强化。

著录项

  • 作者

    Guan, Dah-Liang.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Engineering Materials Science.; Engineering Metallurgy.
  • 学位 Ph.D.
  • 年度 1998
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;冶金工业;
  • 关键词

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