Effects of nanosized TiCp dispersion on the high-temperature tensile strength and ductility of in situ TiCp/Al-Cu-Mg-Si nanocomposites
Effects of nanosized TiCp dispersion on the high-temperature tensile strength and ductility of in situ TiCp/Al-Cu-Mg-Si nanocomposites
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纳米TiCp分散体对原位TiCp/Al-Cu-Mg-Si纳米复合材料高温拉伸强度和延展性的影响
DOI：
10.1016/j.jallcom.2018.10.052
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发表时间：
2019-02
影响因子：
6.2
通讯作者：
Jiang Qi-Chuan
中科院分区：
文献类型：
--
作者：
Gao Yu-Yang;Qiu Feng;Geng Run;Chu Jian-Ge;Zhao Qing-Long;Jiang Qi-Chuan
通过燃烧合成、热压和热挤压方法相结合，在不同碳源（纯炭黑、混合碳源（50 wt% CNTs + 50 wt% 炭黑）和纯 CNT）的 Al-Ti-C 体系中原位制备 TiCp/Al-Cu-Mg-Si 纳米复合材料。采用混合碳源原位合成的TiCp/Al-Cu-Mg-Si纳米复合材料获得了最均匀的纳米TiCp分布、最高的屈服强度(σ0.2)和拉伸强度(σUTS)以及最佳断裂应变(εf)。混合碳源合成的30vol% TiCp/Al-Cu-Mg-Si纳米复合材料在533K时表现出优异的σ0.2(217MPa)、σUTS(251MPa)和εf(17.7%),分别比纯碳黑合成的纳米复合材料(208MPa、241MPa和136%)高4.3%、4.1%和136%。 7.5%），比纯碳纳米管合成的纳米复合材料（209MPa、247MPa和9.4%）分别高3.8%、1.6%和88.3%。混合碳源制备的纳米复合材料优异的高温拉伸强度和延展性归因于纳米TiCp的均匀分布。纳米TiCp和θ'析出物的强化是原位TiCp/Al-Cu-Mg-Si纳米复合材料高温下的主要强化机制。
In situ TiCp/Al-Cu-Mg-Si nanocomposites were prepared in Al-Ti-C systems with different carbon sources (pure carbon black, mixed carbon source (50 wt% CNTs + 50 wt% carbon black) and pure CNTs) via a combination of the combustion synthesis, hot press and hot extrusion methods. The in situ TiCp/Al-Cu-Mg-Si nanocomposites synthesized by the mixed carbon source obtained the most uniform distribution of nanosized TiCp, highest yield strength (σ0.2) and tensile strength (σUTS) and best fracture strain (εf). The 30 vol% TiCp/Al-Cu-Mg-Si nanocomposite synthesized by the mixed carbon source showed superiorσ0.2(217 MPa),σUTS(251 MPa), andεf(17.7%) at 533 K, which were respectively 4.3%, 4.1% and 136% higher than those of the nanocomposite synthesized by pure C black (208 MPa, 241 MPa and 7.5%) and respectively 3.8%, 1.6% and 88.3% higher than those of the nanocomposite synthesized by pure CNTs (209 MPa, 247 MPa and 9.4%). The superior high-temperature tensile strength and ductility of the nanocomposites prepared by the mixed carbon source were attributed to the homogeneous distribution of nanosized TiCp. The strengthening of the nanosized TiCpand θ′ precipitates was the main strengthening mechanism of the in situ TiCp/Al-Cu-Mg-Si nanocomposites at high temperatures.
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