In this study, the cracking behavior and microstructural, mechanical and thermal characteristics of tungsten–rhenium (WRe) binary alloys fabricated by laser powder bed fusion (L-PBF) were investigated. Four bulk specimens were prepared by L-PBF: pure W, W–1%Re, W–3%Re and W–10%Re (percentages indicate the mass percent of Re). High-density bulk specimens (relative density > 98.0%) were obtained for pure W and WRe alloys under the same laser irradiation conditions. The columnar grains elongated along the building direction were gradually refined as the Re content increased. The most remarkable grain refinement was observed for the W–10%Re alloy. Hardness under a high-temperature environment increased with increasing Re content; the micro-Vickers hardnesses of pure W and W–10%Re at 400 °C were 179 ± 4 HV0.1/30 and 281 ± 5 HV0.1/30, respectively. Observations with a scanning electron microscope revealed that the 10 mass% Re addition resulted in a shorter and narrower crack morphology in comparison with pure W and consequently reduced crack area by 59%. Furthermore, the anisotropy of the thermal diffusivity was mitigated in the high Re content specimens, suggesting that, at high Re content, thermal diffusivity is affected less by cracks than by the effect of Re atoms on heat carrier transfer via isotropic scattering.

在这项研究中，研究了激光粉末床熔融 (L-PBF) 制备的钨铼 (W Re) 二元合金的开裂行为和显微结构、机械和热特性。通过 L-PBF 制备了四种大块样品：纯 W、W–1%Re、W–3%Re 和 W–10%Re（百分比表示 Re 的质量百分比）。获得纯 W 和 W 的高密度块状试样（相对密度 > 98.0%）Re合金在相同的激光照射条件下。随着Re含量的增加，沿构建方向拉长的柱状晶粒逐渐细化。对于 W-10%Re 合金观察到最显着的晶粒细化。高温环境下的硬度随着Re含量的增加而增加；纯 W 和 W–10%Re 在 400 °C 下的显微维氏硬度分别为 179 ± 4 HV0.1/30 和 281 ± 5 HV0.1/30。用扫描电子显微镜观察表明，与纯 W 相比，添加 10 质量％的 Re 导致裂纹形态更短更窄，因此裂纹面积减少了 59%。此外，在高 Re 含量样品中，热扩散率的各向异性得到缓解，这表明，在高 Re 含量下，